Question

an element x belongs to 3rd group when that it will react with water it form amphoteric acid write the element name, valancey ,valancey eletrons.​

Answer 1

Explanation:

Given -

• Element X belongs to 3rd group
• It forms Amphoteric oxide when reacts with water

To Find -

1. Element Name
2. Valency
3. Valence electrons

As we know that :-

• Scandium (Sc) belongs to 3rd group and form amphoteric oxide when reacts with water.

Hence,

Element X is Scandium (Sc).

Chemical equation :-

• $\mathsf{2Sc + 6H_{2}O \longrightarrow 2Sc(OH)_{3} + 3H_{2}}$

Here,

$\mathsf{Sc(OH)_{3} \: is \: Amphoteric \: in \: nature. }$

It means, It reacts with both (acid and base).

Electronic configuration of Sc :-

$\mathsf{1s {}^{2} {2s}^{2} {2p}^{6} {3s}^{2} {3p}^{6} {4s}^{2} {3d}^{1} \bold{or} \: [Ar] {3d}^{1} {4s}^{2} }$

Valency = 3

Valence electrons = 3

Group = 3rd

Period = 4th