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Helium - Wikipedia Helium (from Greek: ἥλιος, romanized: helios, lit 'sun') is a chemical element; it has symbol He and atomic number 2 It is a colorless, odorless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table
Helium (He) - Periodic Table Helium (He) Helium is the 2nd element in the periodic table and has a symbol of He and atomic number of 2 It has an atomic weight of 4 00260 and a mass number of 4 Helium has two protons and two neutrons in its nucleus, and two electrons in one shell It is located in group eighteen, period one and block s of the periodic table
Helium | Definition, Properties, Uses, Facts | Britannica Ordinary air contains about 5 parts per million of helium, and Earth’s crust is only about 8 parts per billion The nucleus of every helium atom contains two protons, but, as is the case with all elements, isotopes of helium exist The known isotopes of helium contain from one to six neutrons, so their mass numbers range from three to eight
Atomic Number of Helium He Atomic Number of Helium is 2 Chemical symbol for Helium is He Number of protons in Helium is 2 Atomic weight of Helium is 4 002602 u or g mol Melting point of Helium is -272,2 °C and its the boiling point is -268,9 °C
Periodic Table of Elements: Los Alamos National Laboratory While helium normally has a 0 valence, it seems to have a weak tendency to combine with certain other elements Means of preparing helium difluoride have been studied, and species such as HeNe and the molecular ions He+ and He++ have been investigated
Helium (He) - Periodic Table Helium (He) Helium is a chemical element of the periodic table with chemical symbol He and atomic number 2 with an atomic weight of 4 0026 u and is classed as noble gas and is part of group 18 (noble gases)
Helium | He (Element) - PubChem Periodic Table element Summary Helium Helium is a chemical element with symbol He and atomic number 2 Classified as a noble gas, Helium is a gas at 25°C (room temperature)