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Also 2n2 law of electrons on the outer shell.
This means the max. amount of electrons in the outer shell. x = 2n2n = 1 means x = 2 reached with Heliumn = 2 means x = 8 reached with Neonn = 3 means x = 18 reached with Zincn = 4 means x = 32 reached at Ytterbiumn = 5 means x = 50 not reachedSo in Periode 1 and 2 never d orbitals can reached.