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Rank the following sets of atoms and ions in order of increasing size: Fe, Fe$^{2+}$, Fe$^{3+}$

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Answer: Fe > Fe$^{2+}$ > Fe$^{3+}$
Atomic radii increases down a group, but decreases down a period
The Fe atom with no charge is larger than the Fe$^{2+}$ ion and the Fe$^{3+}$ ion is smaller with a +3 charge compared to the Fe$^{2+}$ ion.
answered Jul 23, 2014 by balaji.thirumalai
edited Jul 23, 2014 by balaji.thirumalai
 

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