Energy Levels of different orbitals•Note hydrogen is the only atom/element in which the energy levels of different orbitals only depend on n.
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Electronic configurations of multielectronatoms•Having established the modern/quantum mechanical picture of the atom, let’s now turn our attention to how this principle relates to the groups and period of the periodic table.18 group periodic table.
Electronic configurations of multielectronatoms•Aufbau principle:oLower energy orbitals fill before higher energy orbitals.oAn orbital can only hold 2 electrons which must have opposite spins.oIf two or more degenerate orbitals are available, one electron goes into each orbital, until all are ½ fill (Hund’s rule). Only then does a 2ndelectron fill one of the orbitals. Each of the singly occupied orbitals must have the same spin quantum number.•H: 1s1•He: 1s2•Li:1s2 2s1Energy1s2sBe: 1s22s2Energy1s2s