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Recall that ionic radius is the size of an ion. The trend for ionic radius is as follows:
Rb+ and Br- have the same number of electrons which means they are isoelectronic.
The ionic radius will just depend on the charge of the ion: the more positive the charge of an ion is, the smaller the ion is.
Rubidium and bromine atoms are depicted below.
Which pair best represents the relative ionic sizes?
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Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.