How does the size of a potassium atom compare with the size of a sodium atom give a reason for your answer

The atomic size of sodium is smaller than the atomic size of potassium.

Let us remember that the atomic size increases down the group as more shell are added to an atom. We should also recall the sodium is ahead of potassium in group one.

This simply means that the atomic size of sodium is smaller than the atomic size of potassium. This is in keeping with the trends of atomic radius down the group.

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potassium (K) has a larger average atomic radius (220 pm)than sodium (Na) does (180 pm). The potassium atom has an extra electron shell compared to the sodium atom, which means its valence electrons are further from the nucleus, giving potassium a larger atomic radius.

Explanation:

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the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.

yes the answer is total mass in unchanged   : )