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Atomic Number and Mass Number

The radius of...

Question

The radius of $N a^{+}$ cation is less than that of Na atom. Give reason.

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Solution

The radius of Na $^{+}$ cation is less than that of Na atom because of decrease of one shell. In Na $^{+}$ cation second shell is the outermost shell but in Na atom, 3rd shell is the outermost shell.

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