Which of the following elements will form an acidic oxide ?

Options

A. An element with atomic number 7
B. An element with atomic number 3
C. An element with atomic number 12
D. An element with atomic number 19

Answer

A

Explanation

Non-metals can form acidic oxides in general. Non-metal have 4 to 8 electron in the outermost shell. The electronic configuration of given element 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) and 19 (K) are metals and hence form basic oxides.