Question

An element 'X' belong to 3 period and group 13 of the Modern Periodic Table.
(a) Determine the number of valence electrons and the valency of 'X'.
(b) What is the molecular formula of the compound formed when 'X' reacts with an element 'Y'? (atomic number = 8).
(c) Write the name and formula of the compound formed when 'X' combines with chlorine.

Answer 1

No of valence electrons of x => 3
X2y3
Xcl3.




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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