Answer:
Option (1).
Explanation:
Atom may be defined as the small part of an element that can be further divisible into the further particles. The three sub atomic particles are electron, proton and neutron.
Electrons revolve around the nucleus and protons, neutrons are present inside the nucleus. The electrons and protons number are equal in the neutral atom. The equal number of electron and proton makes the atom electrically neutral as whole.
Thus, the correct answer is option (1).
