Question

Based on the symbols with valencies & charges write the formula of the following compounds
(i) Mg²⁺Cl⁻ (Magnesium Chloride)
(ii) K⁺Cr₂O₇²⁻ (Potassium dichromate)
(iii) Na⁺AlO₃³⁻ (Sodium aluminate)
(iv) Ca²⁺N³⁻ (Calcium nitride)

Answer 1

Answer:

MgCl2

K2Cr2O7

Na3AlO3

Ca3N2

Explanation:

pls mark as brainliest

Answer 2

(i) MgCl2

(ii) K2Cr2O7

(iii) Na3AlO3

(iv) Ca3N2

Explanation:

(i) Mg²⁺Cl⁻ (Magnesium Chloride)

Given that Mg has 2+ charge. So it needs 2- charges to form a stable molecule. Cl is given as -1 charge. So Mg can attach to two Cl atoms.

Magnesium Chloride chemical formula will be MgCl2

(ii) K⁺Cr₂O₇²⁻ (Potassium dichromate)

Given that K has 1+ charge and Cr₂O₇ has -2 charge. So two atoms of potassium are required to balance one atom of chromate. So Potassium dichromate chemical formula will be K2Cr2O7.

(iii)  Na⁺AlO₃³⁻ (Sodium aluminate)

Given that Na has 1+ charge and AlO₃ has -3 charge. So three atoms of sodium are required to balance one atom of aluminate. So Sodium aluminate chemical formula will be Na3AlO3.

(iv) Ca²⁺N³⁻ (Calcium nitride)

Given that Ca has 2+ charge and N has -3 charge. So three atoms of Ca and two atoms of N will balance each other out. So Calcium nitride chemical formula will be Ca3N2.