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  • Why is francium not included in the reactivity series?

  • Why is potassium considered more reactive when francium is actually!

I know that reactivity increases down the group! But why does it not apply here? Please clarify my doubts.

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Welcome to Stack Exchange. Could you please read the SE standards and edit your question. At least suppress uppercase. –  jlandercy Mar 9 at 9:53
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1 Answer 1

Francium is radioactive. All isotopes of francium are radioactive. The most stable isotope of francium has a half life of only 22 minutes. From the Wikipedia article I linked:

Bulk francium has never been viewed. ... However preparing such a sample is impossible, since the extreme heat of decay (the half-life of its longest-lived isotope is only 22 minutes) would immediately vaporize any viewable quantity of the element.

This extreme radioactivity makes it hard to determine the chemical properties of francium. Some are known. For example, francium's ionization energy is 392.8 kJ/mol (cesium is 375.7 kJ/mol). Since francium has a higher ionization potential than cesium, which it does because of relativistic effects, francium should be less active than cesium. However, since observable quantities are difficult (nearly impossible) to come by. It is hard to say for sure.

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