Multiple choice

Which of the following is lighter than water?

  1. potassium

  2. sulpher

  3. iodine

  4. copper
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Potassium has a density of about 0.862 g/cm³, which is less than water's density of 1 g/cm³. This makes potassium float on water. Sulphur (~2.07 g/cm³), iodine (~4.93 g/cm³), and copper (~8.96 g/cm³) are all denser than water and would sink.

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