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

একটি ইলেক্ট্রনের ভর ________।

1
9.1 × 10-31 কেজি
2
1.67 × 10-27 কেজি
3
9.1 × 10-35 কেজি
4
1.67 × 10-31 কেজি
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