Argon atom is bigger than chlorine atom. Give reason.
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The size of argon is greater than chlorine because of the interelectronic repulsions start taking place when an atom attain its octet.
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The inert gas argon is the next element after chlorine in the third period.
In a period, the size of an atom decreases from left to right due to an increase in nuclear charge with an increase in the atomic number. However, the size of the atoms of inert gases is bigger than the previous atom of halogen in the respective period. This is because the outer shell of inert gases is complete. They have the maximum number of electrons in their outermost orbit; thus, electronic repulsions are maximum. Hence, the size of the atom of an inert gas is bigger.
Explanation:
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