Write the formulae for the compounds formed by the reaction of. Class 9

Write the formulae for the compounds formed by the reaction of. Class 9

Question 1.

Write the formulae for the compounds formed by the reaction of. Class 9

(i) Magnesium and nitrogen

(ii) Lithium and nitrogen

(iii) Sodium and sulfur

(iv) Aluminium and oxygen

Answer:

(i) Magnesium and nitrogen: Mg forms Mg²⁺ (valency 2); N forms N^3- (valency 3).

Formula: Mg₃N₂ (magnesium nitride)

(ii) Lithium and nitrogen: Li forms Li⁺ (valency 1); N forms N^3- (valency 3).

Formula: Li₃N (lithium nitride)

(iii) Sodium and sulfur: Na forms Na⁺ (valency 1); S forms S^2- (valency 2).

Formula: Na₂S (sodium sulfide)

(iv) Aluminium and oxygen: Al forms Al³⁺ (valency 3); O forms O^2- (valency 2).

Formula: Al₂O₃ (aluminium oxide)