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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
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)
Periodic Table of Elements: Los Alamos National Laboratory Seven isotopes of helium are known: Liquid helium (He-4) exists in two forms: He-4I and He-4II, with a sharp transition point at 2 174K He-4I (above this temperature) is a normal liquid, but He-4II (below it) is unlike any other known substance
Helium — Science Learning Hub Its official symbol is He, and its atomic number is 2, which means it has two protons in its nucleus Helium was named after Helios – the Greek Titan of the Sun – because it was first observed when analysing sunlight during a solar eclipse in 1868 A common use of helium is to fill party balloons Balloon image Belchonock, 123RF Ltd