Atomic number o{ the element: 16
Electronic configuration : 2, 8, 6
Period number: Number of shells
The atom of the element has three shells. So, the period number is 3.
The atom of the element has six valence electrons. So, the group number of the element will be 16 (6 + 10).
Valency =8 - number of valence electrons (> 5) or number of valence electrons (<5)