Answer:
(a) Non-metals
can form acidic oxides in general. Non-metals have 4 to 8 electrons in the outermost
shell. The electronic configuration of given elements are
(a) i.e., 7 = 2, 5 (b) i.e., 3 = 2, 1 (c)
i.e., 12 = 2, 8, 2 (d) i.e., 19 = 2, 8, 8, 1.
So, element with atomic number 7 (electronic configuration
2, 5) with is non-metal (N) and it will form an acidic oxide. Rest three
elements atomic numbers, 3 (Li), 12 (Mg) and19 (K) are metals and hence form
basic oxides.
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