Emission spectrum of H

the energy levels for the hydrogen atom.

e- moves from one energy level to a lower energy level.

n = principal quantum number (1,2,3,…)
-describe energy level

RH (Rydberg constant) = 2.18 x 10-18J
Bohr’s Model of the Atom (1913)

Z = atomic number (1 for H)

Moving from lower to
higher energy levels
absorption of
energy (e.g. external
stimulation)

• Energy levels get closer together as n increases
• at n = infinity, E = 0

of energy but can have only certain specified amount; i.e. the energy of an electron is quantized. The specified energy values for an atom are called its energy levels.
As an electron moves instantaneously from one energy level to another, there are no intermediate stages.

Niels Henrik David Bohr was a Danish physicist who made foundational contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel Prize in Physics in 1922.

http://www.youtube.com/watch?v=Ic8OnvRonb0