Where is tellurium on the periodic table

Routes of exposure: The substance can be absorbed into the body by inhalation of its aerosol. Effects of inhalation: Drowsiness. Dry mouth. Metal taste. Garlic odour. Effects of short-term exposure: The aerosol of this substance irritates the eyes and the respiratory tract.

The substance may cause effects on the liver and central nervous system. Exposure may result in garlic-like breath. Medical observation is indicated. Ingestion: Abdominal pain. Chemical dangers: Upon heating, toxic fumes are formed.

Mendeleev concluded that the atomic mass for one of these two elements must be wrong because tellurium clearly preceded iodine in the periodic table. After 50 years of headbanging frustration and effort by a number of chemists to accurately determine the atomic mass of these two elements, the concept of chemical isotopes was discovered.

Isotopes are variant forms of an element that maintain the element's characteristic number of protons, but contain variable numbers of neutrons. As it turns out, the most common isotopes of tellurium have atomic masses of and , whilst iodine's most common isotope has an atomic mass of Thus, tellurium has an average atomic mass of Visit PeriodicVideos 's YouTube channel [ video link ].

Avoid any skin contact. Effects of contact or inhalation may be delayed. Tellurium is used as a basic ingredient in blasting caps, and is added to cast iron for chill control. Tellurium is used in ceramics. Bismuth telluride has been used in thermoelectric devices. Jump to: home search phonebook banner navigation site navigation main content footer navigation. Chemistry Division » Periodic Table of Elements. Sources Tellurium is occasionally found native, but is more often found as the telluride of gold calaverite , and combined with other metals.

Properties Crystalline tellurium has a silvery-white appearance, and when pure it exhibits a metallic luster. Amorphous tellurium is made by precipitating it from a solution of telluric acid. The element is a semiconductor that shows a greater electrical conductivity in certain directions or when exposed to light. Tellurium is often used to improve the machinability of copper and stainless steel. Adding tellurium to lead improves the strength and hardness of the metal and decreases corrosion.

Many thermoelectric devices are made with bismuth telluride.