Given below are some elements of the modern periodic table : (3)4Be, 9Fe, 14Si, 19K, 20Ca(i) Select the element that has one electron in the outermost shell and write its electronic configuration.(ii) Select two elements that belong to the same group. Give reason for your answer.(iii) Select two elements that belong to the same period. Which one of the two has bigger atomic size?

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Answers

2016-02-10T22:26:41+05:30
2016-02-10T22:35:27+05:30
1)K(potassium) has one electron 2,8,8,1 2)Be and Ca as they have same no of valence electron Be2,2 Ca2,8,8,2 3) K & Ca belong to same group K has bigger atomic size as it belongs to 1st group and Ca belong to 2nd.Atomic size decreases as we go from left to right
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