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Helium is a colorless, odorless, non-toxic, inert gas with the atomic number 2 and the symbol He. It is the first element in group 18 of the periodic table and has two stable isotopes, 3He and 4He, and many radioactive isotopes.
Helio es un elemento químico de la tabla periódica con símbolo químico He y tiene número atómico 2 con una masa atómica de 4.0026 u y pertenece a la categoría de elementos gases nobles.
Helium is a colourless, odourless gas with atomic number 2 and relative atomic mass 4.003. It is the second most abundant element in the universe and is used for cooling, balloons, lasers and more.
Helium is the second element in the periodic table with atomic number 2 and symbol He. It is a colorless, odorless, nonmetallic gas with low boiling and melting points, and no known compounds.
Helium, chemical element, inert gas of Group 18 (noble gases) of the periodic table. The second lightest element, helium is a colorless, odorless, and tasteless gas that becomes liquid at -268.9 degrees Celsius. The boiling and freezing points of helium are lower than those of any other known substance.
21 de nov. de 2020 · Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. The chemical symbol for Helium is He. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table.
Helium is a noble gas with atomic number 2 and mass number 4. It has low density, melting and boiling points, and is abundant in the universe but rare on Earth. Learn more about its history, electron configuration, applications, and isotopes.
