Question

7. An element A has
configuration 2,8,8,2. State it's
valence electron. Name the
shells.​

Answer 1

Answer:

valence electron : 2

element : calcium

k   l    m   n

2  8    8     2

Explanation:

Answer 2

Answer:

Element with electronic configuration 2,8,2belongs to 3rd period and 2nd group. The valence electrons give us the idea of group number. As the electrons are divided into 3different shell therefore period number is 3.