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

इलेक्ट्रॉनचे वस्तुमान ________ असते.

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