Question

The correct order of increasing metallic character of \(Na\), \(Be\), \(Mg\), \(Si\) and \(P\) is:

• A. \(P
• B. \(Be
• C. \(P
• D. \(P

Hint:

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

Answer 1

The Correct Option is A

Step 1: Recall periodic trend of metallic character.
Metallic character increases down a group. Metallic character decreases from left to right across a period.

Step 2: Compare period 3 elements.
In period 3: \[ Na,\ Mg,\ Si,\ P \] are arranged from left to right. Metallic character decreases in the order: \[ Na>Mg>Si>P. \] So increasing order among these is: \[ P<Si<Mg<Na. \]

Step 3: Place beryllium.
Beryllium is a metal, but it is smaller and less metallic than magnesium. However, it is more metallic than silicon and phosphorus. So: \[ Si<Be<Mg. \]

Step 4: Final order.
Combining all: \[ P<Si<Be<Mg<Na. \] Therefore, the correct order is: \[ P<Si<Be<Mg<Na. \]