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

किसी तत्व X का परमाणु क्रमांक क्या होगा जो आवर्त 2 और समूह 17 में रखा गया है?

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