Question

an element X belongs to 3rd period and group 16 of the modern periodic table find the molecular formula of compound when X react with hydrogen and write its electron dot structure determine the number of valence electron and valency of X and also determined the element x

Answer 1

the element is Sulphur valence electron is 6 and valency is 2 and the compound formed with Sulphur and hydrogen is H2S

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