An atom it made up of three parts: Protons - neutrons - electrons.
An atom has same number of protons as electrons so atom has no electrical charge.
All atoms of a particular element have the same number of protons.
Atoms of different elements have different numbers of protons.
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Proton: relative mass = 1, relative charge = +1
Neutron: relative mass = 1, relative charge = 0
Electron: relative mass = Very small, relative charge = -1
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