Ionska vez je ena od glavnih kemijskih vezi, ki nastane... Show more
Kemija
Matematika
Angleščina
GeografijaSign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
38
•
Updated Apr 14, 2026
•
Kaj je Ionska Vez?
1 / 5
Uvod v ionsko vez
Verjetno se sprašuješ, kako se atomi povezujejo med seboj, da nastanejo različne snovi okoli nas? Ionska vez je ena od ključnih rešitev te ugakne!
Ta vez nastane med kovinami in nekovinami, ko gre za popoln prenos elektronov. Kovine rade oddajajo elektrone, nekovine pa jih rade sprejemajo. Tako enostavno je!
Ion je atom, ki je postal električno nabit - kation je pozitivno nabit (oddal elektrone), anion pa negativno nabit (sprejel elektrone). Med nasprotno nabitimi ioni nastane močna privlačna sila - to je ionska vez.
Zapomnij si: Ionska vez = kovine + nekovine = popoln prenos elektronov!
Kako nastane ionska vez
Proces je pravzaprav precej logičen, če razumeš oktetno pravilo - atomi hočejo imeti 8 elektronov v zunanji lupini, ker je to najbolj stabilno.
Ko se atom kovine sreča z atomom nekovine, kovina "podarje" svoje valenčne elektrone. Tako postane pozitiven kation, nekovina pa negativen anion. Med njima nastane močna elektrostatična privlačnost.
Toda ioni se ne povezujejo samo v pare! Zaradi močnih sil se uredijo v ionsko kristalno mrežo - to je urejena 3D struktura, kjer je vsak kation obdan z več anioni in obratno.
Pazi: Pri ionskih spojinah ne nastanejo molekule, ampak kristali!
Primeri nastanka ionske vezi
Poglejmo si natrijev klorid (NaCl) - običajno kuhinjsko sol. Natrij ima 1 valenčni elektron, ki ga rad odda, klor pa potrebuje 1 elektron za popoln oktet.
Natrij postane Na⁺, klor pa Cl⁻. Med njima nastane ionska vez v razmerju 1:1, zato je formula NaCl.
Pri magnezijevem fluoridu (MgF₂) je zgodba malo drugačna. Magnezij odda 2 elektrona, vendar vsak fluor sprejme le 1 elektron. Potrebujemo torej 2 atoma fluora za 1 atom magnezija - formula je MgF₂.
Pomembno: Vedno preveri naboje, da bo skupni naboj spojine enak 0!
Lastnosti ionskih spojin
Ionske spojine imajo specifične lastnosti, ki jih lahko razložimo z močnimi vezmi in urejeno kristalno mrežo.
So trde snovi z zelo visokimi tališči - potrebno je namreč veliko energije, da razbiješ močne elektrostatične sile. Hkrati so krhke - če po kristalu udariš, se plasti premaknejo in ioni z enakim nabojem se odbijejo.
Topnost je odvisna od topila - v vodi se večinoma dobro topijo, v olju pa ne. Razlog je v tem, da polarne molekule vode "izvlečejo" ione iz kristalne mreže.
Električna prevodnost je klasično testno vprašanje! Trdne ionske spojine ne prevajajo elektrike, ker so ioni ujeti v mreži. Ko pa se spojina stali ali raztopi v vodi, postanejo ioni gibljivi in prevajajo elektriko.
Za test: Trdna sol ne prevaja, raztopina soli pa prevaja - razlog je gibljivost ionov!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in Kemija
Most popular content
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
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 Knowunity AI. 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 Knowunity AI. 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
Kaj je Ionska Vez?
Ionska vez je ena od glavnih kemijskih vezi, ki nastane med kovinami in nekovinami. Gre za popoln prenos elektronov, ne za deljenje, s čimer atomi dosežejo stabilno elektronsko konfiguracijo.
Uvod v ionsko vez
Verjetno se sprašuješ, kako se atomi povezujejo med seboj, da nastanejo različne snovi okoli nas? Ionska vez je ena od ključnih rešitev te ugakne!
Ta vez nastane med kovinami in nekovinami, ko gre za popoln prenos elektronov. Kovine rade oddajajo elektrone, nekovine pa jih rade sprejemajo. Tako enostavno je!
Ion je atom, ki je postal električno nabit - kation je pozitivno nabit (oddal elektrone), anion pa negativno nabit (sprejel elektrone). Med nasprotno nabitimi ioni nastane močna privlačna sila - to je ionska vez.
Zapomnij si: Ionska vez = kovine + nekovine = popoln prenos elektronov!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Kako nastane ionska vez
Proces je pravzaprav precej logičen, če razumeš oktetno pravilo - atomi hočejo imeti 8 elektronov v zunanji lupini, ker je to najbolj stabilno.
Ko se atom kovine sreča z atomom nekovine, kovina "podarje" svoje valenčne elektrone. Tako postane pozitiven kation, nekovina pa negativen anion. Med njima nastane močna elektrostatična privlačnost.
Toda ioni se ne povezujejo samo v pare! Zaradi močnih sil se uredijo v ionsko kristalno mrežo - to je urejena 3D struktura, kjer je vsak kation obdan z več anioni in obratno.
Pazi: Pri ionskih spojinah ne nastanejo molekule, ampak kristali!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Primeri nastanka ionske vezi
Poglejmo si natrijev klorid (NaCl) - običajno kuhinjsko sol. Natrij ima 1 valenčni elektron, ki ga rad odda, klor pa potrebuje 1 elektron za popoln oktet.
Natrij postane Na⁺, klor pa Cl⁻. Med njima nastane ionska vez v razmerju 1:1, zato je formula NaCl.
Pri magnezijevem fluoridu (MgF₂) je zgodba malo drugačna. Magnezij odda 2 elektrona, vendar vsak fluor sprejme le 1 elektron. Potrebujemo torej 2 atoma fluora za 1 atom magnezija - formula je MgF₂.
Pomembno: Vedno preveri naboje, da bo skupni naboj spojine enak 0!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Lastnosti ionskih spojin
Ionske spojine imajo specifične lastnosti, ki jih lahko razložimo z močnimi vezmi in urejeno kristalno mrežo.
So trde snovi z zelo visokimi tališči - potrebno je namreč veliko energije, da razbiješ močne elektrostatične sile. Hkrati so krhke - če po kristalu udariš, se plasti premaknejo in ioni z enakim nabojem se odbijejo.
Topnost je odvisna od topila - v vodi se večinoma dobro topijo, v olju pa ne. Razlog je v tem, da polarne molekule vode "izvlečejo" ione iz kristalne mreže.
Električna prevodnost je klasično testno vprašanje! Trdne ionske spojine ne prevajajo elektrike, ker so ioni ujeti v mreži. Ko pa se spojina stali ali raztopi v vodi, postanejo ioni gibljivi in prevajajo elektriko.
Za test: Trdna sol ne prevaja, raztopina soli pa prevaja - razlog je gibljivost ionov!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
2
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Mock Exam
Quiz
Flashcards
Essay
Most popular content in Kemija
Most popular content
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
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 Knowunity AI. 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 Knowunity AI. 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