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Q 2752123934.     `S_1` : Long form of periodic table completely helps in predicting the oxidation state of elements.
`S_2` : Metallic and covalent radii of potassium are `203` pm and `230` pm respectivley.
`S_3` : The following set of elements does not represent the correct order of electron affinity values `C < Si > P > N`.
`S_4` : Formation of `Se^(2-)` and `Ar^(-)`, both require the absorption of energy.
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)