Question

Number Of protons and electrons are same in an atom than why is it wrong to say that atomic number Of an atom is equal to its number of electrons ?

Answer 1

The atomic number is the number of protons in an atom of an element. ... By definition, atoms have no overall electrical charge. That means that there must be a balance between the positively charged protons and the negatively charged electrons. Atoms must have equal numbers of protons and electrons.

When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral.
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