The size of the central atom can also be used to determine the angles in the series.
When the central atom is larger, all the electron pairs are naturally at greater distances from
each other. However, the effect is greater for the bonded pairs, which are pulled away from
the central atom by outer atoms. This leads to a relatively larger repulsive effect by the lone
pairs and decreasing angles in the order 0 > S > Se > Te and N > P > As > Sb.