Transcript atomic models ppt lecture

Atomic Models
of
Matter
1. Bohr Model
-Niels Bohr
-Danish scientist
-proposed the Planetary Model in 1913
-Electrons move in
definite orbits around the nucleus
-Each orbit or energy level allows a
certain # of electrons
Energy Levels
1
Maximum # of
Electrons
2
2
8
3
18
4
32
5
18
6
8
7
2
Energy Level in Atom
The Bohr Model
P+
n
2
8
18
32
Can you identify
this atom?
Neon
2. Electron Cloud Model
a. Developed in 1926
b. Electrons move around in
a region called an electron
cloud.
c. The electron cloud surrounds
the nucleus.
d. Describes the region where an
electron is likely to be at any
time.