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CHEM 1151 Lecture Notes - Lecture 3: Azimuthal Quantum Number, Principal Quantum Number, Bohr Model

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sangriamacaw663

26 Sep 2018

School

Northeastern University

Department

Chemistry & Chemical Biology

Course

Professor

Alexander Ivanov

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Document Summary

Bohr model: electrons orbit the nucleus in defined, discrete orbits. Principal quantum number, n, specifies shell and indicates the size of the orbital. Quantum mechanical model: electrons orbit the nucleus in orbitals related to the probability of finding an electron in a particular region of space. Azimuthal quantum number (aka orbital singular momentum quantum number), l, specifies subshell, indicates shape of orbital. 1s to 2s to 3s gets larger, energy level also increases w/ principal quantum number. As the energy levels increase, the electrons are located further from the nucleus, so the orbitals get bigger. 1s orbital has very little electron density near nucleus, more and more as you get further away and decreases past the 95% contour. P-shapes are next most complex, d is most complex. 1dxy, 1dxz, 1dyz are in the xy, xz, and yz planes respectively. D orbitals have 4 lobes that go through the axes.

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Related Questions

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