Helium is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Its boiling point is the lowest among all the elements. Wikipedia
Symbol: He
Atomic mass: 4.002602 u
Atomic number: 2
Electron configuration: 1s2
Electrons per shell: 2
Boiling point: -268.9 °C