If an element emits photon in its ground state due to electron transition , then its .

Options

A. atomic number will increase
B. atomic number will remains unchaged
C. atomic number will decrease
D. mass number will decrease

Answer

C

Explanation

In the ground state electronic transition will occur only when an electron from k-shell i.e., first shell is captured by the nucleus (K - electron capture).Electron so captured converts proton into neutron resulting in the decrease of atomic number.