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

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

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

${\mathrm{Na}}_2{\mathrm{CO}}_3$

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

${\mathrm{CaCl}}_2$

Write the cations and anions present, if any, in the following:

${\mathrm{CH}}_3\mathrm{COONa}$

Write the cations and anions present, if any, in the following 

$\mathrm{NaCl}$

Write the cations and anions present, if any, in the following:

${\mathrm{H}}_2$

Write the cations and anions present, if any, in the ${\mathrm{NH}}_4{\mathrm{NO}}_3$.

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

calcium and fluorine

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

Hydrogen and sulphur