Interpret the number of moles of oxygen atoms in $PO_{4}^{3-}$ ion.

Mass of one atom of oxygen is

The difference in the mass of $100 \, mol$ each of sodium atoms and sodium ions is $5.48002 \, g$. Compute the mass of an electron.

$(i)$ Name the body which approves the nomenclature of elements and compounds.
$(ii)$ The symbol of sodium is written as $Na$ and not as $S$. Give reason.
$(iii)$ Name one element which forms diatomic and one which forms tetraatomic molecules.

What is the difference between $2H$ and $H_2$?

$3.42 \, g$ of sucrose are dissolved in $18 \, g$ of water in a beaker. The number of oxygen atoms in the solution are