Question

ans the question plz​

Answer 1

Explanation:

I will brief out the concept first.

Cross Multiplication method:-

• First, write the elements in horizontal position.

• Write their valencies below. You may memorize it well.

• Cross Multiply.

• Get the compound.

Example :- H2O

H O

1 2

Cross Multiplication, 2 on H's side and 1 on O's side.

We get H2O - Water.

Mg Cl

2 1

Cross Multiplication is applied, Mg_1 and Cl_2

We get MgCl2 - Magnesium Chloride.

Valency Chart :-

• H - 1
• He - N/A
• Li - 1
• Be - 2
• B - 3
• C - 4
• N - 5
• O - 6
• F - 7
• Ne - N/A
• Na - 1
• Mg - 2
• Al - 3,2
• Si - 4
• P - 5
• S - 6
• Cl - 7
• Ar - N/A
• K - 1
• Ca - 2 [Till Z = 20 (Calcium) is enough to remember.]