Question

what are the rules for writing chemical formula of compound? ​

Answer 1

Answer:

The rule for writing chemical formula is as follow: Firstly, write the symbols with positive charge valency first. Secondly, write the valency of each atom on the top of its symbol. Thirdly, divide the valency number by their highest common factor ignore the positive or negative radicle.

Explanation:

Answer 2

Required Answer:

Rules for writing chemical formula of compound:

• The symbols with positive charge valency should be written first.
• Write the cation first followed by the anions.
• Cation receives the charge of anion and vice-versa when the charges are balanced by criss-cross multiplication.
• Valency should be written below the symbol of each element.
• Cross over the valencies of combining atoms.

Example:

Write the valency and symbol of calcium and phosphate :-

We know that,

Calcium - Ca has the valency 2.

Phosphate - PO₄ has the valency 3.

Ca PO₄ having valency as 2, 3.

Here,

Criss-cross the formula of calcium with phosphate valency and chemical formula of phosphate with calcium.

Hence, The chemical formula is Ca₃(PO₄)₂$.$