Question

An element x belongs to 3rd period and group 13 of the modern periodic table determine the valence electron and the valency of x molecular formula of compound formed when x reacts with an element y and write the name and formula of the component from when x combine with chlorine

Answer 1

Element x has 3 shells and 3 valence electrons (since periods=shells and group indicates valence electron)

So element x is Al(aluminium)

Valency of x=+3

X. Cl

3. 1

XCl3

Answer 2

Answer:

Given :

X belongs to period 3rd and group 13th.

Atomic number of X is 13.

Electronic configuration of X

= > 2 , 8 , 3

a ) .

Valance electron in 'X' is 3 .

Valency is 3 as it denote 3 electron to become stable.

b ) .

Given :

Atomic number of Y is 8

Electronic configuration of Y :

= > 2 , 6

Valency of Y is 2 as it need 2 electron to become stable.

Molecular formula X with Y is as :

X     Y

3    2

= > X₂Y₃

c ) .

Valency of X = 3

Valency of Cl = 1

Molecular formula of X with Cl :

X    Cl

3     1

= > XCl₃