An atom has the electronic configuration of $1{\mathrm{s}}^2,2{\mathrm{s}}^{2}2{\mathrm{p}}^6,3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{10},4{\mathrm{s}}^{2}4{\mathrm{p}}^5$. Its atomic weight is 80. Its atomic number and the number of neutrons in its nucleus shall be