Chemistry · Periodic Classification of Elements
निम्नलिखित में से किस तत्व में ठीक 2 इलेक्ट्रॉन कोश (shells) होते हैं, और दोनों पूरी तरह से भरे होते हैं?
- 1बोरॉन
- 2कैल्शियम
- 3नियोन✓
- 4हीलियम
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