the hydrogen atomconsistof one proton nd one electron and Helium atom consists of two protons and two electrons. yet Helium mass is four times as that of hydrogen. why

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Solution

Actually electron does not contribute much to the mass of the atom. Electron is much lighter than proton. Hydrogen has one proton while helium has two proton and two neutron. Since the mass of proton and neutron are same, the mass of helium is four time more than hydrogen.

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