Question

The atomic number of an element is 9.write its electronic configuration and find its valency.                                         ​

Answer 1

Explanation:

The element is Fluorine

Electronic configuration is 2,7

Fluorine (F) has 7 valence electrons.

Thus, it's valency is 1

Answer 2

Answer:

a) Configuration of X(19)=2,8,8,1.

b) It belongs to fourth period and its valency is 1.

c) Basic oxide (X

2

O)

d) X

2

O+H

2

O→2XOH