The electronic configuration of following elements are:
(i) The element Q has three valence electrons. So it loses 3 electrons to gain its stable gas configuration. So, the valency of Q is 3.
(ii) Since P and Q looses 2 and 3 electrons to obtain stable gas configuration, So P and Q are metals. Elements R and S either loses or gain electrons to gain its stable gas configuration. So R and S are Non-metals.
(iii) Since P is the most metallic element among P, Q, R and S. So element P will form the most basic oxide.
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