Answer : 1. "नाभिक मे उपस्थित प्रोटोनो और नट्रॉनो को"
Explanation :

Nucleon is the collective name for two important subatomic particles: the neutron and the proton. Nucleon is one of two types of subatomic particles (neutron and proton) that are located in the nuclei of atoms. Their number is called atomic mass number.