Periodic Table To Date Atomic Number and Atomic Mass Increase left to right Periodic Table To Date Electrons in Valence Shell Defines Chemical Properties 1 e 8 e 4 e ID: 662187
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Slide1
SpectRoscopy
Identifying Elements by ColorSlide2
Periodic Table: To Date
Atomic Number – and Atomic Mass
Increase left to rightSlide3
Periodic Table: To Date
Electrons in Valence Shell
Defines Chemical Properties
1 e-
8
e-
4
e-
2
e-
3 e-
Etc.Slide4
Periodic Table: Today
Electrons in ALL Shells
Defines Chemical Properties
Shell 1
Shell 2
Shell 3
Shell 4
Shell 5Slide5
Element Identification:
Emitted Light
Each element emits a characteristic pattern of bands of light.
These patterns of bands are used to identify
the elementsSlide6
Emitted Light: Why?
Electrons around an atom can be found in different
“shells”
Each
shell
has its own energy level
C
lose to the nucleus = low energyFar from nucleus = high Slide7
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 lightSlide8
Emitted Light: More…
Low energy light
waves
=
long wave lengths =
close to nucleus
High energy light waves = short wave lengths =farther from nucleusSlide9
Emitted Light: Colors!
Different
wavelengths
make
different
colors !
Let’s EXPLORE!!