What does "atomic number 80" mean?

a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures

What is a synonym for "atomic number 80"?

Common synonyms include: hg, hydrargyrum, mercury, quicksilver.

Rare ·Advanced level

Noun

1
a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures wordnet