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ATOMS:
The nucleus:

1. It's in the middle of the atom.
2. Contains protons and neutrons.
3. It has a positive charge because of the protons.
4. Almost the whole mass of the atom is concentrated in the nucleus.
5. But size wise its tiny compared to the rest of…

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ATOMS ARE NOT LOST OR MADE IN CHEMICAL REACTIONS !

During chemical equations thing don't appear out of nowhere and things don't just disappear.
You still have the same atoms at the end of reaction just arranged in a different way.

EG. Sodium + chlorine =sodium chloride

2Na(s) + CI2(g)…

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All the different colours seen in fireworks are due to the colours produced by different elements. What more is that it helps chemists to identify a metal in a compound. Just put a
little bit in a blue Bunsen flame and see what colour is produced.

Each element has a…

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RULES:

1. Electrons always occupy shells.
2. The lowest energy levels are always filled first
3. Only a certain number of electrons are allowed in each shell:

1st shell: 2, 2nd shell:8 , 3rd shell: 8

4. Atoms are much happier when they have a full electron shells.
5. In…

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Ions are made when atoms gain or lose electrons.


























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