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ml = -1
Ms = + 1/2
ms= +1/2
The principal quantum number is the level of the most energetic electrons in an atom. It also corresponds to which period the element is in on the periodic table. For example, barium has a principal quantum number of 6 because its valence electrons are in level 6, and the element is in period 6.
A 2p electron
ms= +1/2
ms = -1/2
ml = -1
Ms = + 1/2
Ms = + 1/2
ms= +1/2
ml = -1
L-1 electron configuration
A 3s electron
A 4d electron; that is for apex :)
Classical free electron theory could not explain many physical properties. In 1928, Sommerfeld developed a new theory applying quantum mechanical concepts and Fermi-Dirac statistics to the free electrons in the metal. This theory is called quantum free electron theory.
The principal quantum number is the level of the most energetic electrons in an atom. It also corresponds to which period the element is in on the periodic table. For example, barium has a principal quantum number of 6 because its valence electrons are in level 6, and the element is in period 6.