Download Quantum Mechanical Model

Name_____________________________________Period_______Date____________
The Quantum Model of the Atom
Directions: Complete the following notes and charts as you read through section 4.2 in
your textbook.
French scientist, ____________________________________, suggested that electrons
have wavelike properties.
Heisenberg uncertainty principle –
Quantum theory –
Orbital –
In the Bohr atomic model, electrons of increasing __________________ occupy orbits
farther and farther from the nucleus.
Quantum numbers -
1. Principal Quantum number(n) -
Energy Level
1
2
3
4
5
6
7
Total number
of orbitals (n2)
Maximum number
of electrons (2n2)
2. Angular Momentum Quantum Number (l) 
sublevel - division of an energy level. Number of sublevel = value of n
Ex:
n = 3  # of sublevels equals 3
n = 4  # of sublevels equals 4

values : l = s(0), p(1), d(2), f(3)

energy : s < p < d < f

l describes the shape of the electron cloud.
Energy Level
# of Sublevels
Value of Sublevels
1
2
3
4
3. Magnetic Quantum Number (m) 
Number of orbitals per sublevel = 2l + 1

Values assigned to orbitals are whole numbers, including zero, from –l to +l.

Max number of electrons per orbital = 2 electrons per orbital
Sublevel
# of Orbitals
Orbital Values
s (0)
p (1)
d (2)
f (3)
4. Magnetic Spin Quantum Number(s) 
values assigned = +1/2 clockwise rotation
-1/2 counterclockwise rotation

electrons with same s quantum numbers have parallel spins
Max # of Electrons