[Atome]

Hello everyone,

   Could you please tell me if this single displacement reaction is true/works?

Fr + CsBr --> Cs + FrBr

I'd like to see if Francium can displace Caesium.

Thanks,

James

[Borek]

Think activity series, think trends in periodic table.

[Mitch]

In aqueous media, the above reasoning isn't valid at all.

[toasty]

If Fr is higher then Cs on the activity theory, then in theory, it should work.

[vhpk]

Perhaps the reason is that Fr is a radioactive element

[Atome]

Thanks for your replies, I am saying that this reaction will work since Francium and Caesium both have a valence of +1.

Is my hypothesis correct?

[Dan]

Your reasoning is not correct. Will Li + CsBr --> Cs + LiBr happen on the grounds that Li and Cs both have a valence of +1?

[constant thinker]

Mitch has a good point about the reaction in an aqueous media.

Perhaps the reason is that Fr is a radioactive element

Also, just because it's radioactive, it doesn't mean it won't react. Uranium naturally exists in an oxide form, and it's radioactive. Other radioactive elements will react and form compounds also.

[Atome]

Thanks for your replies. I see what you mean, and I figured out a new single displacement reaction:

Li + CsI -> Cs + LiI   

I presume that this reaction would work since Lithium is higher than Caesium in the Activity Series, thus displacing the Caesium in Caesium Iodide.

Am I correct?

Thanks.

[Dan]

No, the example was to illustrate that just because the valence is +1 in both cases, doesn't mean the reaction happens. The reaction does not happen because Cs is (much) higher in the reactivity series than Li

Observe:

Li + water

Cs + water

[vhpk]

I  want to ask if there is this reaction:
F₂ + AgNO₃ --> FNO₃ + AgF
If there is this reaction, I want to ask F doesn't have oxidation number +1, yeah, and you see in this reaction is that F has oxidation number +1