Arrange the elements in order of increasing non-metallic properties: P, A1, Mg, Si.

To arrange these elements in order of increasing non-metallic properties, it is necessary to use the scale of relative electronegativity studied by the American chemist L. Pauling. Electronegativity (relative electronegativity) is the fundamental chemical quality of an atom, which characterizes the ability of an atom to pull common electron pairs in a molecule towards itself, that is, the ability to exhibit non-metallic properties.
Mg (1.31) – Al (1.61) – Si (1.90) – P (2.19).