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Francium 221 |
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![](http://www.chemthes.com/icon_5/3055.png"){kind=icon}
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Real, short lived (transient), electronically neutral species.
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![](http://www.chemthes.com/icon_2/3055.gif"){kind=icon} |
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Francium 221
is defined with respect to the entities below: |
The
entities below are defined with respect to:
Francium 221 |
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![](http://www.chemthes.com/icon_5/2745.png"){kind=icon}