Noble gas having ns2np6 configaration but doesn'thave d orbitals
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Part 2 Writing the Noble Gas Electron Configuration
The noble gas is substituted to represent all of the electrons that aren't valence electrons.
The noble gases are helium, neon, argon, krypton, xenon, and radon and are found in the last column of the periodic table.
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It is there to represent that all electron doesn't have same number of valencies and some don't have valencies
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