What is the atomic mass of helium?

an inert, gaseous element present in the sun's atmosphere and in natural gas, and also occurring as a radioactive decomposition product, used as a substitute for flammable gases in dirigible balloons. Symbol: He; atomic weight: 4.0026; atomic number: 2; density: 0.1785 g/l at 0°C and 760 mm pressure. Origin of helium. read more

Helium has exactly two protons and two electrons; it has an atomic number of 2. It also has two neutrons, as its atomic mass minus its atomic number equals two. The element is classified as a noble gas and is found in group 18 on the periodic table. read more

The relative atomic mass is the number which represents how many time an atom of that element is heavier than one twelfth of an atom of Carbon^12. Atomic mass of an element is a fractional quantity . He is the symbol of helium, its atomic mass is 4.0 u. read more

Finding molar mass starts with units of grams per mole (g/mol). When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. read more