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.
Answer - (i) C, O, Ne should be in the same period as these elements contain same number of shells. Similarly, Na and Si should be in the same period.
(ii) C and Si should be in the same group as these elements have same number of valence electrons
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