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  3. Chemistry
  4. The smallest among the following ion is:

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Q. The smallest among the following ion is:

JIPMERJIPMER 1999

Solution:

As we move from left to right in a period, the atomic size of elements decrease, hence among Na, Mg and Al, Al will be smallest. Further atomic size decrease with increase in oxidation number. Hence $ A{{l}^{3+}} $ ion is quite smaller than other three ions as it has maximum positive charge (+ 3).