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What r noble gases
They are atoms with a fully-filled outermost electron shell (Eg: 2,8,8)
What is common in those in same grouping in the Periodic Table?
They hv the same number of electrons in the outermost electron shell
What r outermost electrons called too?
Valence electrons
What is common in those in the same period in the Periodic Table?
They hv the same number of electron shells