How the reducing properties change in the series: Si → P → S → Cl. Which element has the smallest radius

Reducing properties – the ability to donate electrons, this ability is weaker when non-metallic properties are enhanced. Non-metals that belong to the same period and belong to the main subgroups increase their non-metallic properties from left to right. Silicon, phosphorus, sulfur and chlorine belong to the chemical elements of the 3 periods of the main subgroups. This means that the reducing properties in the series Si – P – S – Cl decrease. Silicon (Si) has the smallest atomic radius of the above elements, since it has the smallest number of electrons on the outer electron layer.