Question

In which of the following, the elements Al, B, Mg, and K are correctly arranged in the increasing order of their metallic character?

• A. \( \text{B}<\text{Al}<\text{Mg}<\text{K} \)
• B. \( \text{B}<\text{Mg}<\text{Al}<\text{K} \)
• C. \( \text{Al}<\text{Mg}<\text{K}<\text{B} \)
• D. \( \text{B}<\text{Mg}<\text{K}<\text{Al} \)

Hint:

Metallic character increases down a group and decreases across a period (left to right).

Answer 1

The Correct Option is A

Metallic character increases:
- Down a group
- From right to left in a period
Order of metallic character: - \( \text{B} \) (Group 13, Period 2) — metalloid
- \( \text{Al} \) (Group 13, Period 3)
- \( \text{Mg} \) (Group 2, Period 3)
- \( \text{K} \) (Group 1, Period 4)
Thus, correct increasing order is: \[ \text{B}<\text{Al}<\text{Mg}<\text{K} \]