# SCC Education

## 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)

Chemistry for class 11.....

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