Periodic TableMedium

Question

The correct order of increasing metallic character of $Na,Be,P,Mg$ and Si is

Options

A.$P < Si < Be < Mg < Na$
B.$P < Si < Na < Mg < Be$
C.$P < Mg < Be < Si < Na$
D.$Be < Si < P < Mg < Na$

Solution

Sol. [Key Concept: Metallic character trend across a period / down a group]

On moving left to right in a period, metallic character decreases and on moving top to bottom in a group, metallic character increases. So, the correct order of increasing metallic character is

$$P < Si < Be < Mg < Na$$

Electronegativity $\propto \frac{1}{\text{~}\text{Metallic character}\text{~}}$

Electronegativity (On Pauling scale)

Na Mg Be Si P
0.9 1.2 1.5 1.8 2.1

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