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Τετάρτη 21 Δεκεμβρίου 2016

Orbitals, the Basics: Atomic Orbital Tutorial — probability, shapes, ene...

                

Orbitals, the Basics: Atomic Orbital Tutorial — probability, shapes, ene...

Aνέβηκε στις 1 Αυγ 2011

A crash course tutorial on atomic orbitals, quantum numbers and electron configuration + practice problems explained.

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Academy videos are easy 101 crash course tutorials for step by step
Chemistry help on your chemistry homework, problems, and experiments.
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More on Atomic Orbitals -- Wikipedia
"An
atomic orbital is a mathematical function that describes the wave-like
behavior of either one electron or a pair of electrons in an atom.[1]
This function can be used to calculate the probability of finding any
electron of an atom in any specific region around the atom's nucleus.
The term, atomic orbital, may also refer to the physical region or space
where the electron can be calculated to be present, as defined by the
particular mathematical form of the orbital.[2]

Each orbital in
an atom is characterized by a unique set of values of the three quantum
numbers n, ℓ, and m, which respectively correspond to the electron's
energy, angular momentum, and an angular momentum vector component (the
magnetic quantum number). Any orbital can be occupied by a maximum of
two electrons, each with its own spin quantum number s. The simple names
s orbital, p orbital, d orbital and f orbital refer to orbitals with
angular momentum quantum number ℓ = 0, 1, 2 and 3 respectively. These
names, together with the value of n, are used to describe the electron
configurations of atoms. They are derived from the description by early
spectroscopists of certain series of alkali metal spectroscopic lines as
sharp, principal, diffuse, and fundamental. ...

Atomic orbitals
are the basic building blocks of the atomic orbital model (alternatively
known as the electron cloud or wave mechanics model), a modern
framework for visualizing the submicroscopic behavior of electrons in
matter. In this model the electron cloud of a multi-electron atom may be
seen as being built up (in approximation) in an electron configuration
that is a product of simpler hydrogen-like atomic orbitals. The
repeating periodicity of the blocks of 2, 6, 10, and 14 elements within
sections of the periodic table arises naturally from the total number of
electrons that occupy a complete set of s, p, d and f atomic orbitals,
respectively, although for higher values of the quantum number n,
particularly when the atom in question bears a positive charge, the
energies of certain sub-shells become very similar and so the order in
which they are said to be populated by electrons (e.g. Cr = [Ar]4s13d5
and Cr2+ = [Ar]3d4) can only be rationalized somewhat arbitrarily."

Wikipedia
contributors. "Atomic orbital." Wikipedia, The Free Encyclopedia.
Wikipedia, The Free Encyclopedia, 17 May. 2016. Web. 27 May. 2016.
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