Question

6. (a) Write the number of valence electrons in a Cl-ion.
(b) What is the electronic configuration of sodium?
(c) If Z = 3, what should be the valency of the element. Also name the element.
IS.​

Answer 1

Answer:

a) 1.

Explanation:

chlorine(Cl)have only one electron in its outer shell

Answer 2

Answer:

a) 2

b) 2,8,1

c) +1, Lithium (Li)

Explanation:

a) Valence electrons are the electrons an atom tends to gain, lose or share.

Ca is Z 20.

Its configuration is 2,8,8,2.

It's a metal and thus has +ve valency.

So, its valency is +2.

∴No. of Valence electrons = 2.

b) Sodium is Z 11.

So its configuration would be 2,8,1.

c) Z 3 is Lithium (Li).

Its configuration is 2,1.

It's a metal and thus has +ve valency.

∴Its Valency is +1.