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The elements Li, Na and K, each having o...

The elements Li, Na and K, each having one valence electron, are in period 2, 3 and 4 respectively of modern periodic table.
(1) In which group of the periodic table should they be?
(ii) Which one of them is least reactive ?
(iii) Which one of them has the largest atomic radius?
Give reason to justify your answer in each case.

Text Solution

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(i)They are in group 1 because all the elements in group have 1 valence electron. They form positively charged ions by losing one electron.
(ii) Lithium is least reactive because reactivity of an element depends upon the ability of its atoms to donate or accept electrons.
(iii) Potassium will have largest atomic radius due to the addition of a now shell Atomic size generally increases from top to bottom in a group.
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