Predicting the properties of francium

2 marks · Easy

The density of caesium is 1.87 g/cm³. Based on the trend in Group 1, predict the approximate density of francium. Give your answer to one decimal place.

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Just over 2 g/cm³; accept answers in the range 2.0 – 2.3 g/cm³ g/cm^3 (±0.3)

Also accept: 2.0; 2.1; 2.2; 2.3

Common mistakes: Using caesium value (1.87 g/cm³)

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Marking points

M1 · 1 mark · Uses the trend: density increases down the group.

A1 · 1 mark · Predicts a value just over 2 g/cm³, within the accepted range 2.0–2.3 g/cm³. (follow-through)

Worked solution

The density of Group 1 metals generally increases down the group.