Question

31. An element 'X' belong to 3rd period and group 13 of the Modern Periodic Table.
a. Determine the valence electrons and the valency of 'X'.
b. Molecular formula of the compound formed when 'X' reacts with an element 'Y'
(atomic No. 8)
c. Write the name and formula of the compound formed when 'X' combines with
chlorine ?
(3)​

Answer 1

Answer:

Explanation:

(a)Since it belongs to group 13, therefore no. of valence electrons-3  The Valency of element X is 3

(b)When 'X' reacts with element 'Y', the compound formed will be:

X2Y3.

(c)When X combines with chlorine:

Atomic no of X = 13

i.e. X is Aluminum Al

Valency of X is 3 Valency of chlorine is 1

Therefore, the molecular formula will be: AlCl3