why we called group 18 elements are nobel gases?
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The noble gases (Group 18) are located in the far right of the periodic table and were previously referred to as the "inert gases" due to the fact that their filled valence shells (octets) make them extremely nonreactive. The noble gases were characterized relatively late compared to other element groups.
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Group 18 elements have completely filled orbitals in their shells. So, they don't easily react with any other element or compound. These elements are non - reactive and also referred as inert gases or noble gases.
- Elements or compounds react with each other so as to complete their octet.
- Those which have 1, 2 and 3 electrons in their valence shell, they usually lose electrons.
- Those which have 5, 6 and 8 electrons in their valence shell, they usually gain electrons.
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