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hi.. i have a qstrion frm s block my qstion is reducing agent means the ease of element to loose electron then as in grp1 as w move down the ionization energy drceses then francium must be the most reducing agent however it is lithium why is it so?????

hi.. i have a qstrion frm s block my qstion is reducing agent means the ease of element to loose electron then as in grp1 as w move down the ionization energy drceses then francium must be the most reducing agent  however it is lithium why is it so?????

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1 Answers

Harish R
37 Points
10 years ago

First of all, Francium is radioactive...So it is difficult to study its properties. The following steps are involved in reducing character:

1. M(s) -> M(g)

2. M -> M+  +   e-

3. M+(g)  -> M+(s)

If you consider among Cs and Li, we can agree that Cs has advantage in the first two steps due to low ionisation energy, but Li has a great advantage in the third step due to its very high hydration energy which decreases down the group and is very low for Cs...This is why Li is a better reducing agent.

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