Question:
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.
Solution:
- 6C, 8O, and 10Ne all belong to period 2 as they have two shells whereas 11Na and 14Si belong to period 3 as they have 3 shells.
- 6C and 14Si belong to the same group 14 since they have the same number of valence electrons.