What is the Latin name of Mercury? 

Hydrargyrum

The correct answer is option 2. Hydrargyrum.

The Latin name for mercury, "Hydrargyrum," originates from the Greek words "hydr-" meaning "water" and "argyros" meaning "silver." In ancient times, mercury was often referred to as "hydrargyrum" due to its silver-like appearance and its ability to form liquid droplets similar to water.

Mercury, also known by its chemical symbol Hg, is a metallic element that is liquid at room temperature and has a shiny, silvery appearance. It has been known to humans for thousands of years and has been used in various applications, including medicine, alchemy, and industrial processes.

The Latin name "Hydrargyrum" is still used in scientific contexts today, particularly in chemistry and medicine, to refer to mercury. It is also the basis for the chemical symbol "Hg," derived from the Latin word "hydrargyrum."