nat5 chemistry - unit 1

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UNII 4 The structure of an atom" atoms are made up of three subatomic particles + proton + ㅏ mass and charge of particles Particle proton neutron electron neutron Charge ++ the central part of an atom is called the nucleus in this contains protons + neutrons ad cradona 30 neutrons mass number electron mass atomic number equal to the number of protons location nucleus O orbiting the nucleus if it's in the nucleus it has a mass of 1 atomic number nucleus mass number equals number of protons/ + number of neutrons TY nuclide notation mass number atomic number Isotopes Symbol 56 Fe 26 * Same number of protons but different number of neutro O an atom is electrically neutral as it has an equal number of protons to electrons. Trelative atomic mass 0 • the weight in grams of the number of atoms of the element contained. 2 Bond Covalent molecular ionic trons lattice of Covalent networke metallic BONDING melting + Boiling point -Low high high high. conduct electricity مه no Covalent molecular no Covalent network no (as a solia). yes Covalent Bonding the electrostatic force of attraction between two positive nuclei and a shared pair of electrons. Soluable in water lonic Bonding the electrostatic force of attraction between oppositely charged ions no metallic Bonding the electrostatic force of attraction between positively charged ions and delocalised electrons Jo DOUCO yes. ionic lattice no metallic bonding Shapes of molecules O 0 10 O Pyramidal angular tetrahedral Pyramidal Linear UNIT Y FORMULA prefixes Prefix mono- di- tri- tetra- penta- hexa- valency + number of atoms 1 I swap ↓ Idivide + 1 formula 1 2 3 5 writing formula Symbols write down both symbols. * 6 srilarenmat, soll ← write down it's valency Swap the valencies over ← if possible divide the valencies throug Ja atm UNIT Y O 0 C D + + RATES OF Reaction signs of a chemical reaction! precipitate (solid is formed) is produced a a gas + a colour change + a change in energy. energy changes! exothermic - heat...

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