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Chemistry

Identify the most stable atom from the following list. Give reason for your answer

1123Na^{23}{11}\text{Na},   1735Cl^{35}{17}\text{Cl},   1840Ar^{40}{18}\text{Ar},   1327Al^{27}{13}\text{Al}

Atomic Structure

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Answer

The most stable atom from the given list is 1840Ar^{40}_{18}\text{Ar} (Argon).

Reason — Argon is a noble gas with a completely filled outermost shell, making it chemically inert and highly stable.
In contrast, the other atoms, 1123Na^{23}{11}\text{Na}, 1735Cl^{35}{17}\text{Cl}, 1327Al^{27}_{13}\text{Al}, have incomplete outer shells and are therefore reactive as they tend to gain, lose, or share electrons to achieve stability.

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