The following table shows the position of five elements A, B, C, D and E in
the modern periodic table.
Answer the following giving reasons:
(i) Which element is a metal with valency two?
(ii) Which element is least reactive?
(iii) Out of D and E which element has a smaller atomic radius?
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Answer:
2. cesium
3. from right to left in period and top to bottom of group of period table atomic radius decreases
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