Quantam Numbers

Quantam Numbers - n ---> shell l --->...

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Unformatted text preview: n ---> shell l ---> subshell ml ---> orbital ms ---> electron spin 1, 2, 3, 4, ... 0, 1, 2, ... n - 1 -l ... 0 ... +l +1/2 and -1/2 Electron Spin and Magnetism Diamagnetic: all electrons paired; NOT attracted to a magnetic field Paramagnetic: substance is attracted to a magnetic field. • Substances with unpaired electrons are paramagnetic. Ferromagnetic: Substance with unpaired, aligned electrons; strongly attracted to a magnetic field. 1 Pauli Exclusion Principle No two electrons in the same atom can have the same set of 4 quantum numbers. Consequence: MAXIMUM OF TWO ELECTRONS PER ORBITAL! 2 Assigning Electrons to Atoms •  Electrons generally assigned to orbitals of successively higher energy. •  For H atoms, En = - Rhc/n2. Energy depends only on n. •  For multi-electron atoms, energy depends on both n and l. Assigning Electrons to Subshells In a multi-electron atom: •  subshells increase in energy as value of n + l increases. •  for subshells of same n + l, subshell with lower n is lower in energy. 3 Electron Configurations and the Periodic Table 4 ...
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Quantam Numbers - n ---> shell l --->...

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