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Mathematics 21 Online
OpenStudy (anonymous):

Helium Atom A proton and a neutron each weigh 1.67 ´ 10–24 gram. An electron weighs 9.11 ´ 10–28 gram. One helium atom contains 2 protons, 2 neutrons, and 2 electrons. Find the mass of one helium atom.

OpenStudy (anonymous):

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