MediumChemistryHigh School (9–10)GeneralThe Periodic Table › Groups and FamiliesConceptualBoard Exam
Francium is the alkali metal below caesium in group 1…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Francium is the alkali metal below caesium in group 1. Use the trends to predict these.
- Its state at room temperature.
- How it reacts with water, compared with caesium.
- Its valency.
- The formula of its chloride.
- Whether it melts above or below caesium's .
Need a reminder? The key ideaShow
The position predicts the valency, the formulas, the reactivity and the nature of an element. A property in the middle of a group can be estimated as the average of its two neighbours, but only roughly.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) A soft metal, a solid or nearly liquid in a warm room.
Step 2. (b) Even more violently than caesium, because its outer electron is farther out.
Step 3. (c) Valency : one outer electron.
Step 4. (d) FrCl.
Step 5. (e) Below , since melting points fall down the group.
Answer: a soft metal; more violent; ; FrCl; below .
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