Approximately 4.01
It's just 4.002602 amu
Helium is a non metal element. Atomic mass of it is 4.00.
Helium with an atomic mass of 4.00260
The Hydrogen atom. Beware, Hydrogen has an atomic mass based on one proton, as it doesn't have a neutron. So Helium has a mass of four times Hydrogen.
relative atomic mass
It's just 4.002602 amu
Helium is a non metal element. Atomic mass of it is 4.00.
Helium with an atomic mass of 4.00260
Helium is a non metal element. Atomic mass of it is 2.
4.002602 g/mol
relative Atomic Mass
relative atomic mass
Helium's atomic number is 2 and its atomic mass is 4
The Hydrogen atom. Beware, Hydrogen has an atomic mass based on one proton, as it doesn't have a neutron. So Helium has a mass of four times Hydrogen.
the relative atomic mass for the element potassium is 39.0983
Helium is a semi-metal(metalloid). Helium belongs to group 8(noble gases) and period 1 in the periodic table. It has a relative atomic mass of 4, an atomic number of 2.
Relative atomic mass, also called atomic weight, is listed on the periodic table for each element. There is no element listed on the periodic table with a relative atomic mass of 15.5.