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Problem: Arrange the following in order of increasing radius:O2-, F- , Ne, Rb+, Br-

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We are being asked to rank the given species in order of increasing radius


The given species are ions and a neutral atom. When ranking compounds based on their ionic radius, we have the following rules:

The more electrons that an atom/ion possess, the bigger it is.

Cations (positively charged ions) tend to be smaller than their parent atoms

            Positive charge → lost electrons

Anions (negatively charged ions) tend to be bigger than their parent atoms

            Negative charge → gained electrons

Comparing atoms and ions that are isoelectronic or with the same number of electrons:

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Problem Details

Arrange the following in order of increasing radius:

O2-, F- , Ne, Rb+, Br-

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Periodic Trends concept. If you need more Periodic Trends practice, you can also practice Periodic Trends practice problems.

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Based on our data, we think this problem is relevant for Professor Harris' class at UF.