Question

why is potassium less heavy compared to sodium

Answer 1

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Basically, in the case of sodium andpotassium 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

Answer 2

Answer:

basically in this case of sodium and potassium increase in the shell size outweigh the pull of core on the outer shell electron and so potassium is less dense then sodium....

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