Which of the following alkali metal ions has smallest ionic size?Only one correct answerA.Rb+Rb+B.Cs+Cs+C.Li+Li+D.Na+Na+
Question
Which of the following alkali metal ions has smallest ionic size?Only one correct answerA.Rb+Rb+B.Cs+Cs+C.Li+Li+D.Na+Na+
Solution
The alkali metal ion with the smallest ionic size is Li+.
Here's why:
The size of an ion is determined by its atomic radius. In the periodic table, as you move down a group (column), the atomic radius increases. This is because each row adds a new electron shell.
The alkali metals are in the first group of the periodic table. From top to bottom, the order is: Li, Na, K, Rb, Cs.
So, Li+ is at the top of the group and has the fewest electron shells, making it the smallest alkali metal ion.
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