Question

Which quantity of helium may be represented by the symbol He?

Answer 1

Helium is a chemical element. Its official symbol is He, and its atomic number is 2, which means it has two protons in its nucleus

Answer 2

4.0026 atomic mass unit

Step-by-step explanation:

The symbol "He" represents the chemical element helium. Helium is a colorless, odorless, and non-toxic gas that is the second lightest element in the periodic table. It is represented by the atomic number 2 and has an atomic mass of about 4.0026 atomic mass units (u). Helium is known for its low boiling point, making it commonly used as a cryogenic refrigerant and for filling balloons. It is also used in various scientific and industrial applications, such as cooling superconducting magnets, as a shielding gas in welding, and as a component in gas chromatography.