Teaching DSSSB TGT Mock Test 2025 General Science Chemistry Basic Concepts of Chemistry

इलेक्ट्रॉनों के एक मोल का द्रव्यमान है:

1
8.0 × 10-25 g
2
8.4 × 10-26 g
3
8.5 × 10-27 g
4
इनमें से कोई नहीं
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