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For the following set of atoms and ions, arrange the members in order of decreasing size:...

For the following set of atoms and ions, arrange the members in order of decreasing size: Rank items from largest to smallest. To rank items as equivalent, overlap them.

Co3+ , Fe3+, Fe2+

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Answer #1

Atomic number of Co is 27 so the number of electrons are 27 and number of protons are 27

After removing 3 electrons we get Co3+ & it contains 24 e & 27 p

Fe3+ contains 23 e & 26 p

Fe2+ contains 24 e & 26 p

Among Fe2+ & Fe3+,both contains 26 p( as nuclear charge) but the number of electrons more in Fe2+ so the ionic radius of Fe2+ is more.

Among Fe2+ & Co3+ , both contain same number of electrons but the nuclear charge is more in Co3+ .

Therefore the order of ionic radius is : Fe2+ > Fe3+ > Co3+

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