A sodium atom is more likely to react with a chlorine atom than a potassium atom.
The atoms of elements in the periodic table are arranged in groups and periods. The elements in the same group of the periodic table have similar reactivity.
We know that metals do not often combine with each other except in alloys. Metals of group 1 such as sodium and potassium do not form alloys hence they do not combine.
On the other hand, the electronegativity difference between sodium and chlorine is high. This causes the both of them to easily combine and form and ionic compound.
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