Hydrogen telluride (H2Te) is a chemical compound composed of hydrogen and tellurium. It is a diatomic molecule, meaning it consists of two atoms (one hydrogen atom and one tellurium atom) bonded together. Hydrogen telluride is a colorless gas with a pungent and foul odor, similar to that of hydrogen sulfide (H2S). It is a highly toxic and reactive compound with limited practical applications.

Here are some key points about hydrogen telluride:

1. Physical Properties: Hydrogen telluride is a gas at room temperature and atmospheric pressure. It is denser than air and has a higher boiling point compared to hydrogen sulfide (H2S).
2. Odor: Hydrogen telluride has a strong and unpleasant odor that resembles the smell of rotten garlic or rotten onions. Its odor is detectable at very low concentrations.
3. Toxicity: Hydrogen telluride is highly toxic and poses a significant health risk when inhaled or absorbed through the skin. It can affect the central nervous system and lead to a range of adverse health effects. Exposure to high concentrations can be lethal.
4. Natural Occurrence: Hydrogen telluride can be produced naturally in certain geological processes and can be present in some natural gas deposits and volcanic gases.
5. Chemical Reactions: Hydrogen telluride is reactive and can participate in various chemical reactions. It can form salts with metal cations and undergo redox reactions.
6. Applications: Due to its toxic and foul-smelling nature, hydrogen telluride has very limited practical applications. It is mainly studied for its chemical properties and behavior in controlled settings.
7. Safety Precautions: Because of its toxicity and noxious odor, hydrogen telluride should be handled with extreme caution. Proper safety measures, protective equipment, and ventilation are essential when working with this compound.
8. Tellurium Chemistry: Hydrogen telluride is part of the group of hydrogen chalcogenides, which also includes hydrogen sulfide (H2S), hydrogen selenide (H2Se), and hydrogen oxide (H2O).

Due to its extreme toxicity and foul odor, hydrogen telluride is not used in common industrial or commercial applications. It is mainly studied for its chemical properties and behavior in research and controlled laboratory settings.