Which of the following is the electronic configuration in last orbit of a
noble gas
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Lewis postulated that inert gas atoms are chemically inert because they hold 8 valence electrons. The valence electron pattern in these atoms is called an inert gas electron configuration. Chemists also call this a Lewis octet.
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Helium belongs to the 1st period of the periodic table and has an atomic number of two.
The two electron fills the 1s orbital and hence has completely filled valence shell.
That's why Helium is the only noble gas with 2 electrons in its valence shell.
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