Difficulty: Medium
Average Score: 80%
Simulated
Which metal is liquid at room temperature?
Correct answer
A
Rationale
Mercury is the only metal that exists as a liquid at standard room temperature and pressure. It has a melting point of -38.83├é┬░C and a boiling point of 356.73├é┬░C. Mercury├óÔé¼Ôäós unique liquid state arises from weak metallic bonding and relativistic effects that lower its melting point. It has historically been used in thermometers, barometers, and electrical switches, although its toxicity has limited its modern use. Its chemical symbol, Hg, originates from the Latin word 'hydrargyrum', meaning liquid silver. Despite its hazards, mercury├óÔé¼Ôäós distinctive physical properties continue to fascinate scientists.