railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Chemistry Structure of Atom

પેટા-પરમાણુ કણો છે:

1
ઈલેક્ટ્રોન્સ
2
પ્રોટોન
3
ન્યુટ્રોન
4
ઉપરના બધાજ 
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