Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Chemistry Structure of Atom
The Mass of Atom is entirely due to ________.
1
Prototons & Neutrons
2
Neutrons
3
Electrons
4
More than one of the above
5
None of the above