Question

why does tge density of low than sodium​

Answer 1

Answer:

Sodium has low density. that's the law of nature. that's the property of sodium. you can't ask why.

Answer 2

Basically, in the case of sodium and potassium the increase in shell size outweighs the pull of the core on the outer shell electron and so potassium is less dense than sodium. When we more from Na to K, effect of increase in volume is more pronounced as compared to effect of increase in atomic mass. Sodium is less dense bcoz it's the nature of it.

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