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www.reference.com/science/mass-helium-nucleus-ff8ab9b052006515

The mass of the helium nucleus is 6.64 x 10^-27 kilograms. The mass is calculated by adding together the mass of two protons, each of which has a mass of 1.67 x 10^-27 kilograms and two neutrons, which each have a mass of 1.67 x 10^-27 kilograms.

en.wikipedia.org/wiki/Helium_nucleus

Alpha particles, also called alpha ray or alpha radiation, consist of two protons and two neutrons bound together into a particle identical to a helium-4 nucleus.They are generally produced in the process of alpha decay, but may also be produced in other ways.Alpha particles are named after the first letter in the Greek alphabet, α.The symbol for the alpha particle is α or α 2+.

en.wikipedia.org/wiki/Helium-4

The total spin of the helium-4 nucleus is an integer (zero), and therefore it is a boson (as are neutral atoms of helium-4). The superfluid behavior is now understood to be a manifestation of Bose–Einstein condensation, which occurs only with collections of bosons.

physicsnet.co.uk/a-level-physics-as-a2/nuclear-energy/mass-and-energy

The mass difference described above represents a loss of energy. The helium nucleus has less energy than the separate nucleons had (remember E=mc 2 mass and energy are interchangeable). This is the binding energy. The binding energy of a nucleus is the energy which would be required to separate the nucleus into its individual separate nucleons.

Best Answer: Since the mass of an electron is about 1/1837th the mass of a proton, then it will take many, many electrons to equal the *mass* of the helium nucleus. Since the mass of of the helium nucleus is approx. 4.00 amu, then ... 4 amu x 1837 electrons /1 amu = 7348 electrons You would need about 7350 electrons to equal the mass of a helium nucleus.

people.nscl.msu.edu/~schatz/PHY983_13/Lectures/mass.pdf

The mass of a nucleus ... Therefore, mass of nucleus is smaller than the total mass of the nucleons by the binding energy dm=B/c2 . How many protons and neutrons can be filled in ? As many as one likes as potential is created by nucleons !!! ... Example: The sun is powered by the fusion of hydrogen into helium:

www.quora.com/What-is-the-atomic-mass-of-helium

Since the nucleus of a helium 4 atom is made up of 2 neutrons and 2 protons, the sum total of these components is 4.031882 amu. One amu, atomic mass unit, is defined as one twelfth of the mass of a carbon 12 atom. This is not the mass of the helium nucleus, only the mass of the components when they are measured separately.