Question

Electronic configuration of an element is 2 8 7 the atomic number of this element is? and its symbol is?

Answer 1

Explanation:

(a)The atomic number of element with electronic configuration 2,8,7=17.

(b)It has 7 valence electrons, therefore it would be chemically similar to F(9)=2,7.

Answer 2

Explanation:

atomic number-17

and

Its symbol- Cl(chlorine)

HOPE THAT HELPS!!