Writing of Formulae of Ionic Compounds

The formula of carbonate of a metal $\mathrm{M}$ is ${\mathrm{M}}_2{\mathrm{CO}}_3$. What will be the formula of its phosphate? 

The formula of carbonate of a metal $\mathrm{M}$ is ${\mathrm{M}}_2{\mathrm{CO}}_3$. What will be the formula of its nitride?

The formula of carbonate of metal $\mathrm{M}$ is ${\mathrm{M}}_2{\mathrm{CO}}_3$. What will be the formula of its iodide?

If the aluminium salt of an anion $\mathrm{X}$ is ${\mathrm{Al}}_2{\mathrm{X}}_3$, what is the valency of $\mathrm{X}$? What will be the formula of the magnesium salt of $\mathrm{X}$? 

An element A forms an oxide A₂O₅. What will be the formula of chloride of A?

An element Y has a valency of 4. Write the formula for its nitrate. 

An element Y has a valency of 4. Write the formula for its carbonate.

An element Y has a valency of 4. Write the formula for its sulphate.

An element Y has a valency of 4. Write the formula for its oxide.

An element Y has a valency of 4. Write the formula for its chloride.

The valencies(or charges) of some of the ions are given below: 

Ion                        Valency(charge)                Ion                         Valency(charge)

Sodium ion                1+                       Nitrate ion                           1-

Copper ion                2+                       Sulphide ion                       2-

Using this information, write down the formula of copper nitrate.

The valencies(or charges) of some of the ions are given below: 

Ion                        Valency(charge)                Ion                         Valency(charge)

Sodium ion                1+                       Nitrate ion                           1-

Copper ion                2+                       Sulphide ion                       2-

Using this information, write down the formula of sodium sulphide.

Give the formula of the following compound formed from the following sets of elements:

sodium and oxygen 

Give the formula of the following compound formed from the following sets of elements; 

carbon and chlorine

Give the formula of the following compound formed from the following sets of elements:

Hydrogen and sulphur

Give the formula of the following compound formed from the following sets of elements; 

calcium and fluorine

Name the following compound. Also, write the symbols/formulae of the ions present in it.

${\mathrm{CaCl}}_2$

Name the following compound. Also write the symbols/formulae of the ions present in them:

${\mathrm{Na}}_2\mathrm{O}$

Calculate the formula mass of the following compound

Aluminium oxide (Given, Atomic mass of $\mathrm{Al}=27\mathrm{u}$; $\mathrm{O}=16\mathrm{u}$)

Work out the formula for the following compound:

Calcium carbonate