The atomic radius of chemical elements decreases in the series 1) Si → Al → Mg 2) Be → Al → C

The atomic radius of chemical elements decreases in the series 1) Si → Al → Mg 2) Be → Al → C 3) As → P → N 4) F → Cl → Br

The atomic radius of chemical elements decreases in the series 3) As → P → N;
Within a group, the atomic radius increases from top to bottom. This is due to the fact that the elements of one group differ in the number of electron layers, and the more there are, the larger the size of the atom. In our case, from As to N: – the number of electron layers of atoms decreases; -the radius of the atoms decreases.