An element X is forming acidic oxide. Its most probable position in the modern periodic table is(A) Group 1 and Period 3 (B) Group 16 and Period 3 (C) Group 17 and Period 3 (D) Group 2 and Period 3

Correct Answer: (C) Group 17 and Period 3  

Explanation: Acidic nature of the oxides of elements increases across a period. This means that the element at the rightmost position in a period will have the most acidic oxide.