Question

The existence of excitation and ionisation energies in an atom is an evidence for

• A. Stability of an atom
• B. Electrical neutrality of an atom
• C. Small size of the atom
• D. Stationary orbits in an atom

Answer 1

Answer: (A)

Stability of an atom

The minimum energy required to excite an electron from the ground state of an atom to any excited state is called excitation energy. Lesser the energy more the stability of an atom. An electron can be in an excited state for a long time if it has less energy and hence more stability.