Helium is the lightest noble gas, so neon, argon, krypton and xenon are all heavier noble gases. Radon's also a noble gas and it's heavier than helium, but it's radioactive so is it really inert?
Well, two times four is eight, which would be oxygen.
It's just 4.002602 amu
Helium is a non metal element. Atomic mass of it is 4.00.
The mass of a calcium atom is around 40 atomic mass units (u), while the mass of a helium atom is around 4 atomic mass units (u). Therefore, the mass of a calcium atom is 10 times greater than the mass of a helium atom.
Helium with an atomic mass of 4.00260
Helium is a non metal element. Atomic mass of it is 2.
4.002602 g/mol
Helium's atomic number is 2 and its atomic mass is 4
Approximately 4.01
Helium is a metal element. Atomic number of it is 2.
Symbol: He atomic #: 2 atomic mass: 4.002602
Atomic mass = weight in gram / moles = 10 / 2.5 = 4 amu