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Chemistry
Unit 1 - Atomic Structure and Bonding Related to Properties of Materials | nat4 Chemistry
204
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24 Nov 2025
•
Atomic Structure and Bonding Related to Material Properties | Basic Chemistry Concepts
A
Alex
@mastermind12362
1 / 8
Understanding Elements
Everything in our world is made from about 100 different chemical elements that combine in various ways. An element is a substance containing only one type of atom, making it the simplest substance possible.
All elements are arranged in the periodic table, which organizes them based on their properties. A dark zigzag line separates metals (on the left) from non-metals (on the right). The table is divided into periods (horizontal rows) and groups (vertical columns).
Elements in the same group have similar chemical properties because they react in similar ways. Some groups even have special names like the Alkali metals, Halogens, and Noble gases.
Quick Fact: The periodic table isn't just a random arrangement! Elements are organized by increasing atomic number, which means they follow a logical pattern that scientists use to predict their properties.
Inside the Atom
Atoms are made up of three key particles: electrons, protons, and neutrons. These tiny components determine how elements behave.
Electrons are negatively charged particles that orbit the nucleus in circles called energy levels. They're incredibly light - their mass is practically zero. Protons are positively charged particles found in the nucleus (the atom's center) with a mass of 1 atomic mass unit (amu). Neutrons have no charge but also live in the nucleus with a mass of 1 amu.
The nucleus has an overall positive charge because of the protons, while the electrons spinning around it are negative. In a normal atom, the number of protons equals the number of electrons, making the atom neutral overall (no charge).
Remember This: Think of an atom like a tiny solar system. The nucleus is like the sun at the center, while the electrons are like planets orbiting around it in specific paths called energy levels.
Atomic Numbers and Mass
Every element has its own unique atomic number, which tells you how many protons it contains. Elements in the periodic table are arranged by increasing atomic number - hydrogen is 1, helium is 2, and so on.
The mass number appears at the top left of an element's symbol (like ²³Na) and tells you the total number of protons and neutrons in the atom. For sodium (Na), the atomic number is 11 (meaning 11 protons and 11 electrons), and the mass number is 23. This means sodium has 12 neutrons (23 - 11 = 12).
You can easily work out any element's structure using these numbers. For example, magnesium has a mass number of 24 and atomic number of 12, so it has 12 protons, 12 electrons, and 12 neutrons.
Top Tip: To find the number of neutrons in any atom, just subtract the atomic number from the mass number. It's that simple!
Electron Arrangement
Electrons are arranged in energy levels around the nucleus. The first energy level (closest to the nucleus) holds a maximum of 2 electrons, while other levels can hold up to 8 electrons (for the first 20 elements).
We write electron arrangements as a series of numbers separated by commas. For example, sodium's electron arrangement is 2,8,1. This means it has 2 electrons in the first energy level, 8 in the second, and 1 in the third.
Elements in the same group of the periodic table have the same number of outer electrons (electrons in the outermost energy level). These outer electrons determine an element's chemical properties, which explains why elements in the same group behave similarly.
Did You Know? Your chemical personality is like your outer electrons! Just as your outside appearance is what others react to first, it's the outer electrons of atoms that determine how they'll react with other elements.
Understanding Compounds
When elements join together, they form new substances called compounds. There are millions of different compounds, each with its own unique properties based on the type of bonds formed between elements.
Naming compounds follows simple rules. The element furthest left in the periodic table comes first (like sodium chloride). If there are only two elements, the name ends with "-ide" (like copper sulfide). If there are three elements including oxygen, the name usually ends with "-ate" or "-ite" (like calcium carbonate).
Some compound names include prefixes that tell you how many atoms of each element are present. For example, "mono-" means one, "di-" means two, and "tri-" means three. So carbon monoxide (CO) has one carbon atom joined to one oxygen atom.
Make It Stick: When you see chemical names like "carbon dioxide," break them down by their parts. "Di-" means two, so dioxide = two oxygen atoms. This helps you remember the formula is CO₂.
Covalent Bonding
A covalent bond forms when two non-metal atoms share a pair of electrons. Imagine two atoms holding hands - that's similar to how covalent bonding works! The positive nuclei of both atoms are attracted to the shared electrons between them.
Covalent bonds are strong and create what we call molecules - groups of atoms held together by these shared electron pairs. Carbon dioxide is a good example of a covalently bonded compound.
Covalent compounds typically have low melting and boiling points, which is why they're usually gases or liquids at room temperature. They also don't conduct electricity because they don't have free electrons or ions to carry charge.
Real-World Link: The oxygen you breathe (O₂) is a covalent molecule! Two oxygen atoms share electrons, creating a strong bond that keeps them paired together as they travel through your lungs and into your bloodstream.
Ionic Bonding
Ionic bonds form between metals and non-metals when electrons are completely transferred rather than shared. The metal atom loses electrons (becoming positively charged), while the non-metal gains electrons (becoming negatively charged).
For example, when magnesium (Mg) bonds with chlorine (Cl), magnesium loses its two outer electrons to become a Mg²⁺ ion. Chlorine gains one electron to become a Cl⁻ ion. The positive and negative ions are strongly attracted to each other, forming an ionic bond.
Ionic compounds form lattice structures - regular arrangements of positive and negative ions. This gives ionic compounds distinct properties: they have high melting points, are solid at room temperature, and conduct electricity when melted or dissolved in water (but never as solids).
Analogy Alert: Think of ionic bonding like a football team trading players. The metal "trades away" its outer electrons to the non-metal, creating two charged ions that are attracted to each other - just like how two teams might be connected after trading players!
Comparing Bonds and Properties
Ionic and covalent compounds have very different properties because of their different bonding types. Ionic compounds dissolve easily in water, which breaks up their lattice structure and allows their ions to move freely - this is why they can conduct electricity when dissolved.
Ionic compounds have high melting and boiling points and are solid at room temperature because of the strong attractions between their positive and negative ions. In contrast, covalent molecular compounds have low melting and boiling points, are typically liquids or gases at room temperature, and never conduct electricity.
Understanding these differences helps explain why materials behave as they do. For example, table salt (sodium chloride) is an ionic compound that dissolves in water and conducts electricity when dissolved, while sugar (a covalent compound) dissolves but doesn't conduct electricity.
Exam Tip: A common test question asks you to identify if a substance is ionic or covalently bonded based on its properties. Remember: high melting point and conduction when dissolved or molten = ionic; low melting point and no conduction = covalent molecular.
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Paul T
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
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Atomic Structure and Bonding Related to Material Properties | Basic Chemistry Concepts
A
Alex
@mastermind12362
The world around you is built from atoms, which combine in specific ways to form everything you see. Let's explore how atomic structure determines the properties of materials, and how different elements join together to create compounds with unique characteristics.
Understanding Elements
Everything in our world is made from about 100 different chemical elements that combine in various ways. An element is a substance containing only one type of atom, making it the simplest substance possible.
All elements are arranged in the periodic table, which organizes them based on their properties. A dark zigzag line separates metals (on the left) from non-metals (on the right). The table is divided into periods (horizontal rows) and groups (vertical columns).
Elements in the same group have similar chemical properties because they react in similar ways. Some groups even have special names like the Alkali metals, Halogens, and Noble gases.
Quick Fact: The periodic table isn't just a random arrangement! Elements are organized by increasing atomic number, which means they follow a logical pattern that scientists use to predict their properties.
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Inside the Atom
Atoms are made up of three key particles: electrons, protons, and neutrons. These tiny components determine how elements behave.
Electrons are negatively charged particles that orbit the nucleus in circles called energy levels. They're incredibly light - their mass is practically zero. Protons are positively charged particles found in the nucleus (the atom's center) with a mass of 1 atomic mass unit (amu). Neutrons have no charge but also live in the nucleus with a mass of 1 amu.
The nucleus has an overall positive charge because of the protons, while the electrons spinning around it are negative. In a normal atom, the number of protons equals the number of electrons, making the atom neutral overall (no charge).
Remember This: Think of an atom like a tiny solar system. The nucleus is like the sun at the center, while the electrons are like planets orbiting around it in specific paths called energy levels.
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Atomic Numbers and Mass
Every element has its own unique atomic number, which tells you how many protons it contains. Elements in the periodic table are arranged by increasing atomic number - hydrogen is 1, helium is 2, and so on.
The mass number appears at the top left of an element's symbol (like ²³Na) and tells you the total number of protons and neutrons in the atom. For sodium (Na), the atomic number is 11 (meaning 11 protons and 11 electrons), and the mass number is 23. This means sodium has 12 neutrons (23 - 11 = 12).
You can easily work out any element's structure using these numbers. For example, magnesium has a mass number of 24 and atomic number of 12, so it has 12 protons, 12 electrons, and 12 neutrons.
Top Tip: To find the number of neutrons in any atom, just subtract the atomic number from the mass number. It's that simple!
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Electron Arrangement
Electrons are arranged in energy levels around the nucleus. The first energy level (closest to the nucleus) holds a maximum of 2 electrons, while other levels can hold up to 8 electrons (for the first 20 elements).
We write electron arrangements as a series of numbers separated by commas. For example, sodium's electron arrangement is 2,8,1. This means it has 2 electrons in the first energy level, 8 in the second, and 1 in the third.
Elements in the same group of the periodic table have the same number of outer electrons (electrons in the outermost energy level). These outer electrons determine an element's chemical properties, which explains why elements in the same group behave similarly.
Did You Know? Your chemical personality is like your outer electrons! Just as your outside appearance is what others react to first, it's the outer electrons of atoms that determine how they'll react with other elements.
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Understanding Compounds
When elements join together, they form new substances called compounds. There are millions of different compounds, each with its own unique properties based on the type of bonds formed between elements.
Naming compounds follows simple rules. The element furthest left in the periodic table comes first (like sodium chloride). If there are only two elements, the name ends with "-ide" (like copper sulfide). If there are three elements including oxygen, the name usually ends with "-ate" or "-ite" (like calcium carbonate).
Some compound names include prefixes that tell you how many atoms of each element are present. For example, "mono-" means one, "di-" means two, and "tri-" means three. So carbon monoxide (CO) has one carbon atom joined to one oxygen atom.
Make It Stick: When you see chemical names like "carbon dioxide," break them down by their parts. "Di-" means two, so dioxide = two oxygen atoms. This helps you remember the formula is CO₂.
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Covalent Bonding
A covalent bond forms when two non-metal atoms share a pair of electrons. Imagine two atoms holding hands - that's similar to how covalent bonding works! The positive nuclei of both atoms are attracted to the shared electrons between them.
Covalent bonds are strong and create what we call molecules - groups of atoms held together by these shared electron pairs. Carbon dioxide is a good example of a covalently bonded compound.
Covalent compounds typically have low melting and boiling points, which is why they're usually gases or liquids at room temperature. They also don't conduct electricity because they don't have free electrons or ions to carry charge.
Real-World Link: The oxygen you breathe (O₂) is a covalent molecule! Two oxygen atoms share electrons, creating a strong bond that keeps them paired together as they travel through your lungs and into your bloodstream.
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Ionic Bonding
Ionic bonds form between metals and non-metals when electrons are completely transferred rather than shared. The metal atom loses electrons (becoming positively charged), while the non-metal gains electrons (becoming negatively charged).
For example, when magnesium (Mg) bonds with chlorine (Cl), magnesium loses its two outer electrons to become a Mg²⁺ ion. Chlorine gains one electron to become a Cl⁻ ion. The positive and negative ions are strongly attracted to each other, forming an ionic bond.
Ionic compounds form lattice structures - regular arrangements of positive and negative ions. This gives ionic compounds distinct properties: they have high melting points, are solid at room temperature, and conduct electricity when melted or dissolved in water (but never as solids).
Analogy Alert: Think of ionic bonding like a football team trading players. The metal "trades away" its outer electrons to the non-metal, creating two charged ions that are attracted to each other - just like how two teams might be connected after trading players!
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Comparing Bonds and Properties
Ionic and covalent compounds have very different properties because of their different bonding types. Ionic compounds dissolve easily in water, which breaks up their lattice structure and allows their ions to move freely - this is why they can conduct electricity when dissolved.
Ionic compounds have high melting and boiling points and are solid at room temperature because of the strong attractions between their positive and negative ions. In contrast, covalent molecular compounds have low melting and boiling points, are typically liquids or gases at room temperature, and never conduct electricity.
Understanding these differences helps explain why materials behave as they do. For example, table salt (sodium chloride) is an ionic compound that dissolves in water and conducts electricity when dissolved, while sugar (a covalent compound) dissolves but doesn't conduct electricity.
Exam Tip: A common test question asks you to identify if a substance is ionic or covalently bonded based on its properties. Remember: high melting point and conduction when dissolved or molten = ionic; low melting point and no conduction = covalent molecular.
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This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
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Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
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Best app on earth! no words because it’s too good
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iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user