Multiple choice general knowledge science & technology

Which of the following is in liquid form at room temperature?

  1. Lithium

  2. Sodium

  3. Francium

  4. Cerium
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Francium is liquid at or slightly above room temperature (melting point ~27°C), though it's extremely rare and radioactive. Lithium melts at 180°C, sodium at 98°C, and cerium at 795°C - all solid at room temperature (25°C). Francium's low melting point follows the trend of increasing atomic size in Group 1.

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