railway RRB ALP (CBT 1 + CBT 2 + CBAT) Mock Test Series 2025 (New) General Science Chemistry Classification of Elements and Periodicity in Properties

आवर्त 2 आणि गण 17 मध्ये ठेवलेल्या X मूलद्रव्याचा अणुअंक किती असेल?

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