1.

Choose from the following : ""_(20)Ca,""_(3)Li, ""_(11)Na, ""_(10)Ne (i) An element having two shells completely filled with electrons. (ii) Two elements belonging to the same group in the periodic table.

Answer»

Solution :(i) The element is `""_(10)NE , 2, 8`
(ii) The elements are `""_(3)Li,and""_(11)Na" , "Li(2,1)" , "Na(2,8,1).`


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