Question

the element X has 3shells . the number of electrons present in the outermost shell is 7.
a.write the electronic configuration of the element X
b.find the group of number of element X
c.write the period number of the element x​

Answer 1

K L M

2 8 7 [ electronic configuration ]

( so the atomic no.of that element is 17 element is chlorine because it has atomic no. 17 ).

• group of number is 17 of chlorine.

• period no. is 3

its the answer....