1. Atomic emission spectrum
Why different elements emit different colors.

2. Expectation 7: Element spectrum tubes
Prentice Hall, Inc.
Each element has a different number of electrons.
These electrons have different amounts of energy associated with them.
When energy is added to the element the electrons produce a line spectra: a set of different wavelengths of light are emitted.
The line spectrum for each element is like a fingerprint. Every element has a different line spectrum because they have different number of electrons.