As compared to Phosphorous, Sodium has a smaller atomic radius and less metallic character.
In the periodic table, the atomic radius increases down the group. The increase in the atomic number puts the outermost electrons far away from the nucleus. The decreased force of attraction acts on the outermost electrons results in an increase in the atomic radius.
The sodium has been at the top of the periodic table, thus the atomic radius of Na is smaller than the Phosphorous.
The metallic character also increases on going down the group.
Thus the as compared to Phosphorous, Sodium has a smaller atomic radius and less metallic character.
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