In the series of chemical elements Si → Al → Mg a) the charges of atomic nuclei increase: b) the number

In the series of chemical elements Si → Al → Mg a) the charges of atomic nuclei increase: b) the number of electrons in the outer electron layer of atoms increases; c) electronegativity decreases; d) the radii of the atoms decrease; e) enhanced metallic properties.

In the series of chemical elements Si – Al – Mg:

* Decreases electronegativity;

Electronegativity is the property of atoms to pull off electron density. It grows with an increase in the number of electrons at the outer level within one period.

* Metallic properties are enhanced.

The smaller the number of electrons at the outer level, the easier it is for atoms to give them away, meaning to exhibit metallic properties.