Question

Why does the potassium have a larger atomic radius than the sodium and lithium

Answer 1

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Atomic radii increase in size as you progress down the columns of the periodic table. This is because as you add more electrons, and fill more electron shells, the total radius across the atom increases.

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Answer 2

Potassium has an atomic number of 19
It's electronic configuration will be 2,8,9
These electrons can be accommodated in three shells
Sodium has an atomic number of 11.
It's electronic configuration will be 2,8,1
These electrons can also be accommodated in 3shells but there is only 1electron in the outermost shell.
Lithium has an atomic number of 3.
It's electronic configuration will be 2,1
It can be accomodated in 2shells.
Because of the large atomic sells of Potassium, it's atomic radius is Much larger than that of Sodium or Lithium.

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