Answers

2016-02-24T18:33:20+05:30
This is due 2 density of sodium whish is greater than potassium. sodium is denser than potassium because there is a sudden increase in atomic size and atomic volume as we move frm sodium to potassium. when we move frm sodium to potassium as volume increases atomic mass increases.
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2016-02-24T18:58:54+05:30
Evn though K have more protons , neutrons and electrons 
Na encloses these things in a smaller radius and have high density 

mass proportionl to density
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