Description : What is the chemical sign of helium and what are the main properties of this substance? Maybe you can write something about the use of helium?
Last Answer : The chemical symbol for helium is He. Main properties of helium: Atomic mass: 4.002602 u 0.000002 u License plate: 2 Electronic structure: 1s2 Boiling point: -268.9 ° C Discovery time: 1868. Melting ... is also used as a shielding gas. Used to preserve food. It is also used to test for leaks.