Q5 of 56 Page 1

Choose from the following:

6C, 8O, 10Ne, 11Na, 14Si


(i) Elements that should be in the same period.


(ii) Elements that should be in the same group. State reason for your selection in each case

The Electronic configuration of the following are:


C – 2, 4


O – 2, 6


Ne – 2, 8


Na – 2, 8, 1


Si – 2, 8, 4


(i) The elements having same number of shells should be in the same period. Elements 6C, 8O, 10Ne have the two energy shells. So, they belong to the same period i.e. period 2.


(ii) The elements which have same number of valence electrons lie in the same group. 6C, 14Si have 4 valence electrons. So, 6C, 14Si belong to same group i.e. 14th group.


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