9--18-20-22 chem notes (AutoRecovered).docx

9--18-20-22 chem notes (AutoRecovered).docx - 9-18 CHEM...

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9-18 CHEM NOTES Erwin Schrodinger and Quantum mechanics o Represents the wave function , which is a function of the coordinates of the electron’s position in 3D space A specific wave function is termed as an orbital Wave function does not provide information about the pathway of the electron. Heisenberg Uncertainty Principle There is a fundamental limitation to just how precisely we can know both the position and momentum of a particle at a given time Quantum numbers They express the properties of the orbital o Principle quantum number (n) has integral values related to the size and energy of the orbital o Angular momentum quantum number (l) (lowercase L) Integral values from 0 to n – 1 Related to the shape Electron subshells s Orbital p Orbital No charge at the node (point of separation of lobes) Electron Spin Electron spin quantum number ( m s ¿ can be +1/2 or -1/2 o Electron can spin in either of the tow opposite directions Pauli exclusion principle states that in a given atom no two electrons can have the same set of four quantum numbers An orbital can hold only two electrons o Must have opposite spins o Only two values of ( m s ¿ are allowed
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