1. Identifying Elements by Color
SpectRoscopy
Identifying Elements by Color

2. Periodic Table: To Date
Atomic Number – and Atomic Mass
Increase left to right

3. Periodic Table: To Date
Etc.
Electrons in Valence Shell
Defines Chemical Properties

4. Periodic Table: Today Electrons in ALL Shells
Defines Chemical Properties

5. Element Identification: Emitted Light
Each element emits a characteristic pattern of bands of light.
These patterns of bands are used to identify the elements

6. Emitted Light: Why?
Electrons around an atom can be found in different “shells”
Each shell has its own energy level
Close to the nucleus = low energy
Far from nucleus = high

7. Emitted Light: More…
When “energized” electrons can jump up to higher energy level shells
When they move back down they give off some energy as light

8. Emitted Light: More… Low energy light waves =
long wave lengths = close to nucleus
High energy light waves =
short wave lengths = farther from nucleus

9. Emitted Light: Colors! Let’s EXPLORE!!
Different wavelengths make different colors !
Let’s EXPLORE!!