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

పీరియడ్ 2 మరియు గ్రూప్ 17లో ఉంచబడిన మూలకం X యొక్క పరమాణు సంఖ్య ఎంత?

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