Question

Choose from the following: 6C, 8O, 10Ne, 11Na, 14Si a) Elements that should be in the same period. b) Elements that should be in the same group. State reason for your selection in each case.

Answer 1

Electronic Configuration

C - 2,4

O - 2,6

Ne - 2,8

Na - 2,8,1

Si - 2,8,4

Elements in which electrons are filled in the first 2 shells: C,O and Ne. So these elements lie on the same period

Elements in which are filled in the first 3 shells: Na and Si. So these elements lie in the same period

Elements with same number of valence electrons:C,Si. So these elements lie in the same group

Answer 2

Answer:

Electronic Configuration

C - 2,4

O - 2,6

Ne - 2,8

Na - 2,8,1

Si - 2,8,4

Elements in which electrons are filled in the first 2 shells: C,O and Ne. So these elements lie on the same period

Elements in which are filled in the first 3 shells: Na and  Si.So these elements lie in the same period

Elements with same number of valence electrons : C ,Si. So these elements lie in the same group