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1Atomic NumberThe number of protons in the nucleus of an atom. This number is unique for each element.
2Mass Nu.mberThe number of protons plus neutrons in the nucleus of an atom. That is, the particles that contribute to the mass of the atom.
3Chemical SymbolMass number
atomic number
4Number of NeutronsMass number - Atomic number
(Protons + Neutrons) -
( Protons)
5ChargeAn atom will be neutral if the number of protons and the number of electrons it has are equal. However, an atom will have a positive charge when it loses electrons ( because there will be more positive protons than negative electrons) and a negative charge when it gain electrons ( because there will be more negative than positive protons).