Find the total number of atoms present in one $SO_{4}^{2-}$ ion.

$A$ change in the physical state can be brought about:

Which of the following would weigh the highest?

Compute the difference in masses of one mole each of aluminium atoms and one mole of its ions. (Mass of an electron is $9.1 \times 10^{-28} \,g$). Which one is heavier (in $,g$)?

What is the difference between a cation and an anion?

Calculate the number of moles in $60 \text{ g}$ of carbon. (in $\text{ moles}$)