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Mercury is a metal with the symbol Hg and atomic number 80. Its properties are quite distinct from those of other metals: it exists in liquid form even at room temperature. For this reason it is known as a “liquid metal.” It has a bright silvery appearance and is a very dense element.HistoryMercury has been known to humanity for thousands of years. In ancient times it was used in medicine and alchemical studies. Ancient civilizations used mercury in certain medicines and metal treatments despite

Thallium is a metal with the symbol Tl and atomic number 81. It has a silvery-white appearance and is a soft, malleable element. It occurs rarely in nature and is found in small amounts within certain minerals.HistoryThallium was discovered in 1861 by the British chemist Sir William Crookes. Its name derives from the Greek word “thallos,” meaning “green shoot,” due to the green spectral line observed in thallium. This discovery was an important example demonstrating that elements could be identi