Teaching UP TGT Mock Test Series 2025 General Science Chemistry Classification of Elements and Periodicity in Properties

किसी तत्व का इलेक्ट्रान विन्‍यास 2, 8, 5 है, तो इसकी प्रोटानों की संख्या ज्ञात कीजिए?

1
8
2
15
3
2
4
5
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