A. Proton and neutron
B. 2 protons and 2 neutron
C. 3 protons and 2 neutrons
D. 4 protons only
Free MCQs for FPSC, NTS, PPSC, PMS, CSS & All Pakistan Exams 2026
A. Proton and neutron
B. 2 protons and 2 neutron
C. 3 protons and 2 neutrons
D. 4 protons only