Deduce and fill in the missing data in the table below

CHEMISTRY · Subjective · A Level · Chemistry · Atomic structure · Atomic structure

Problem

Deduce and fill in the missing data in the table below.

Element and nuclide symbol	Atomic number	Mass number	Number of protons	Number of neutrons	Number of electrons
$^{16}_{8}\mathrm{O}$	8	16	8	8	8
$^{56}_{28}\mathrm{Ni}$	28	56	28	28	28
$^{41}_{20}\mathrm{Ca}$	20	41	20	21	20
$^{23}_{11}\mathrm{Na}$	11	23	11	12	11
$^{57}_{26}\mathrm{Fe}$	26	57	26	31	26