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22-05-2017
Chemistry

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List the rules that are necessary to follow in writing chemical symbols.

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05-06-2017

1. Should know the Atomic Number of each element (also equal to the number of protons
2. Should know the Mass number (equals to protons + neutrons)
3. Should know the element's symbol or abbreviation (e.g. C for carbon, Ar for argon etc.)
4. Should know the number of electrons

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