## Quantum Mechanics,Quantum Numbers

Quantum
Mechanics

•Quantum Mechanics = explains the
behavior of very SMALL, FAST moving objects

Quantum Mechanics

overview

•We will see: electrons have discrete
energies, not

because they are in shells but because they can only

have certain

__wavelengths__
•Line spectra are not due to electrons
jumping from shell

to shell (as in Bohr’s model)…

•Instead they’re due to electrons
transforming from one

wavelength (waveform) to another

•Each electron is a wave that can be
described by a

series of “quantum numbers”

•There are four quantum numbers: n, l, ml, ms

•The combination of the first 3 defines an
“orbital”

Classifying electron waves

•The waves of electrons are similarly class-ified

according to certain variables (n, l, ml)

•The rationale for the numbers is not always clear.

These numbers come from some pretty advanced

math. You don’t have to know why we use
certain

formulas for determining quantum numbers

.

You do have to know what the formulas are, when to use
them,
and what the resulting quantum numbers represent

Quantum Numbers

There
are four numbers that come into the theory of

electron clouds as waves called
quantum numbers.

The
first quantum number, n, is the principle energy

level.
This is the 1 in 1s2. It can have the
values 1, 2, 3, …

The
second quantum number, l, is the sublevel. The nth

principle energy level has n sublevels.
We refer to these

sublevels by letters: s, p, d, f, g, h, i, j, k, … Sometimes

numbers are used too: 0, 1, 2, 3,
…(n-1)

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**Chemistry for class 11.....**

Quantum Mechanics,Quantum Numbers,Quantum Mechanics,Quantum Numbers,Quantum Mechanics,Quantum Numbers,

sharma sir,scceducation,chemistry ,9718041826,free notes,free cbse study material,ncert solution,

sharma sir,scceducation,chemistry ,9718041826,free notes,free cbse study material,ncert solution,

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