defence exam Army Havildar SAC Mock Test Series 2025 Chemistry Classification of Elements and Periodicity in Properties Periodic Table

खालीलपैकी कोणते मूलद्रव्य आधुनिक आवर्त सारणीच्या गट 1 मध्ये नाही?

1
सोडियम
2
रेडियम
3
पोटॅशियम
4
लिथियम
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