Arrange the elements in ascending order of non-metallic properties: CL, Mg, S, F, C, I, Na.

To arrange these elements in a row in ascending order of non-metallic properties, it is necessary to use the scale of relative electronegativity proposed by the American chemist L. Pauling. Electronegativity (relative electronegativity) is a fundamental chemical property of an atom, which characterizes the ability of an atom in a molecule to displace common electron pairs towards itself, that is, to exhibit non-metallic properties.
Na (0.98) – Mg (1.31) – C (2.55) – S (2.58) – I (2.66) – Cl (3.16) – F (3.98).