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What is an atom made up of ?
Sub-atomic particles called protons, neutrons and electrons.
Atomic number
The number of protons the atom has in its nucleus.
Why are atoms electricly neutral?
They have the same amount of protons as electrons.
Mass number
The protons plus the number of neutrons in its nucleus. It is the larger number below the element symbol in the periodic table.
Isotopes
Are atoms of the same element which have different numbers of electrons.
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