Question

Which of the following statement is always correct?

(a) an atom has equal number of electrons and protons

(b) an atom has equal number of electrons and neutrons

(c) an atom has equal number of protons and neutrons

(d) an atom has equal number of electrons, protons and neutrons

Answer 1

(a) An atom has equal number of protons and electrons

An atom always has equal number of protons and electrons in order to maintain electrical neutrality.