1. Electrons

2. Location Surrounding nucleus
Exact location unknown, they are always in motion
Found in electron cloud
High probability area of finding electrons

3. Energy levels
electron cloud has energy levels where electrons are found
Energy levels close to the nucleus have least amount of energy
Each energy level holds certain number of electrons
normal state (not excited)
electrons in lowest energy levels
close to nucleus

4. electrons absorb energy Electrons can move to higher energy levels
cannot stay there for long (unstable)
when energy is lost the electrons emit light and drop to a lower energy level

5. larger the number of energy levels dropped, the shorter the wavelength of light emitted (higher frequency)
elements emit certain colors called the emission spectra for that element

6. Electromagnetic Spectrum
Contains all the types of electromagnetic radiation (forms of light)
contains visible light and non-visible sources of radiation
When atoms absorb energy and then release it, they emit electromagnetic radiation in the form of visible light

7. certain wavelength/frequency will emit only a certain color of light
↑energy, ↑ frequency, ↓wavelength

8. Smallest wavelength (highest frequency, greatest energy)  largest wavelength (lowest frequency, smallest energy)
Gamma rays, x rays, UV rays, visible light (VIBGYOR), infrared, radar, microwave, radio waves