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All substances are made of tiny particles called atoms. We cannot see atoms, but an understandingof
what atoms are and the difference between atoms is very important if we are to make sense of

The Size of Atoms

Atoms are tiny. If 100 000 000…

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These two numbers can be used to work out how many protons, neutrons and electrons there are in an
atom. Remember that because atoms are neutral, the number of electrons will always be equal to the
number of protons.

Number of protons = atomic number
Number of neutrons = mass…


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