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Chemistry Revision
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Page 1
ATOMS AND ELEMENTS
Atoms are tiny particles.
The nucleus contains protons and neutrons.
Protons - Positive Charge
Neutrons - Neutral Charge
Electrons - Negative Charge
If a substance only contains one type of atom its called an element.
Different elements have atoms with differents numbers of protons.
Page 2
THE PERIODIC TABLE
This symbol is magnesium
The atomic number is 12 because there are 12 protons in an atom of magnesium.
The mass number is 24 because there are 24 protons and neutrons in total in an atom of magnesium.
You can find out the neutron numbver by subtracting the atomic number by the mass number.
All of the elements in a group have the same number of electrons in their outer shell.
Page 3
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- GCSE Chemistry Note on Chemistry Revision, created by Simran Heart on 03/02/2019.
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- Simran Heart
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