Helium (symbol He) is element number 2 of the periodic table and belongs to the “Noble gas” category. Its atomic mass is about 4.0026, and its phase under standard conditions is Gas. This element sits in period 1 and group 18 of the periodic table, and its electrons are arranged in shells of 2. The short electron configuration of Helium is 1s². Known uses of Helium include Balloons, Coolant in MRI and High-temperature welding.
The electron configuration of Helium (He), with 2 electrons, is shown below. The last shell (shell 1) is highlighted:
Distribution of 2 electrons of Helium across shells K to K:
The noble gases are the group 18 elements: their outer shell is full, so under normal conditions they are very unreactive.
The atomic number of Helium (He) is 2; that is, every atom of it has 2 protons.
The electron configuration of Helium (He) is 1s²; in short form it is 1s², and its last shell is 1s².
The chemical symbol of Helium is He.
Helium is located in period 1 and group 18 and belongs to the “Noble gas” category.
The atomic mass of Helium is about 4.0026 (atomic mass units).
The phase of Helium under standard conditions is Gas.
Uses of Helium include Balloons, Coolant in MRI and High-temperature welding.
Helium was discovered by William Ramsay in 1895.
Neon (Ne)Argon (Ar)Krypton (Kr)Xenon (Xe)Radon (Rn)Oganesson (Og)
Neon (Ne)Argon (Ar)Krypton (Kr)Xenon (Xe)Radon (Rn)Oganesson (Og)
