Question

C6, O8,Ne10,Na11,Si14 (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 group.

Answer 1

c6 o8 ne10
na11 si14 same period
si14c6

Answer 2

Electronic configuration of elements are-

C   At. No. 6         2,4

O   At. No. 8         2,6

Ne  At. No. 10       2,8

Na  At. No. 11         2,8,1

Si   At. No. 14         2,8,4

Ans 1:-

Carbon C, Oxygen O and Neon Ne are the element  of same period 2nd and Sodium Na and Silicon Si belong to same period 3rd because according to their electronic configuration C,O and Ne have two orbit K and L and Na and Si have three orbit K,L and M.

Ans 2:-

Carbon C and Silicon Si are belongs to same group because they have same no of valance electron which represent same group.