The chemical symbol for helium is He. The ground state electronic configuration of neutral hydrogen is 1s 1 and the term symbol of hydrogen is 2 S 1/2. Crude helium, concentrated to perhaps 70% and containing nitrogen, argon, neon, and hydrogen, undergoes final purification at pressures up to 18.7 MPa (2700 psi). Helium is an element that has the atomic number 2 and is a gaseous substance. Key Terms: Atomic Mass, Atomic Number, Deuterium , Helium, Hydrogen, Isotopes of Helium, Protium, Tritium. The crude material is chilled to 77 deg K in liquid nitrogen -cooled coils of a heat exchanger. The Sun is composed primarily of the chemical elements hydrogen and helium.At this time in the Sun's life, they account for 74.9% and 23.8% of the mass of the Sun in the photosphere, respectively. The electron configuration of helium is 1s 2. Although hydrogen is the most abundant element in the universe (three times as abundant as helium, the next most widely occurring element), it makes up only about 0.14 percent of Earth’s crust by weight.It occurs, however, in vast quantities as part of the water in oceans, ice packs, rivers, lakes, and the atmosphere. Hydrogen: description Your user agent does not support the HTML5 Audio element. The atomic symbol of helium is 4 2 He. All heavier elements, called metals in astronomy, account for less than 2% of the mass, with oxygen (roughly 1% of the Sun's mass), carbon (0.3%), neon (0.2%), and iron (0.2%) being the most abundant. What is Helium. Helium-3 (3 He see also helion) is a light, stable isotope of helium with two protons and one neutron (the most common isotope, helium-4, having two protons and two neutrons in contrast).Other than protium (ordinary hydrogen), helium-3 is the only stable isotope of any element with more protons than neutrons. Helium-3 was discovered in 1939. Tim and Moby introduce you to atoms, which contain all the elements in the universe, and to the concepts of atomic number and atomic mass. Atoms are everything!

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