defence exam Agniveer Army Technical Mock Test Series 2025 General Science Chemistry Classification of Elements and Periodicity in Properties
The atomic number of an atom is equal to the:
1
total number of protons present in the nucleus of an atom
2
sum of the number of electrons and that of neutrons
3
half of the number of electrons present in the nucleus of an atom
4
sum of the number of protons and that of neutrons