Caption: Atom with valence shell showing 8 electrons. Atoms of Hydrogen and Helium are shown with valence shells of only 2 electrons. Hydrogen and Helium take their place with noble gasses on Periodic Table. For an atom to be stable, its outer shell of electrons, its valence shell, must be full. For most elements the valence shell can hold 8 electrons. Due to their small size, atoms of hydrogen and helium can only hold 2 electrons. Among single atoms the valence shell is full only in inert or noble gases like helium, krypton, neon, and others along the right side of the periodic table. Noble gases have a very stable electron configuration and, as a result, do not seek to bond with another element. But for all other atoms to be stable, they must gain or lose electrons, or share them with other atoms.

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Keywords: atom, electron, helium, hydrogen, neutron, noble gasses, periodic table, proton, valence shells

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Valence shells and noble gases

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Duration: 00:00:56.01

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