s block elements, Chemistry

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why lithium and beryllium markedly differ from other members of their respective groups?

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The ratio of area covered by second orbital to the first orbital is: (1) 1 : 2  (2) 1 : 16       (3) 8 : 1           (4) 16 : 1 Ans:  16 : 1

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200 g of water at 30 degrees C is mixed with 20 g of silver at 350 degrees C, what''s the final temp?

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