Multiple choice

The metal mercury

  1. is the hardest known metal

  2. is liquid at room temperature

  3. is highly radioactive

  4. is extensively used in the construction of aircrafts

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mercury is a chemical element with the symbol Hg and atomic number 80. It is well known for being the only metallic element that is liquid at standard temperature and pressure.