Chem Unit 2

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Z is

atomic number
Isotopes

atoms of same element with different masses
Avogadro's number
- 23
- 6.02* 10
Electromagnetic radiation

radio waves, microwaves, x rays, etc
Electromagnetic specturm

arranged from a long to short wavelength or low to high frequencies
Wavelength

distance between corresponding points
Frequency (v)

number of waves that pass a given point at a specific time
quantum

minimum quantity of energy that can be lost or gained by atom
photoelectric effect

emmision of electroms from metal when light is shined on it
electromagnectic radiation strikes the surface of metal...

...ejecting electrons from the metal, causing electrical current
photon

particle of electromagnetic radiation having zero mass
emission

electron falls to a lower energy level
absorption

energy added to atom to move electron from lower to higher energy level
diffraction

bending of waves
interference

waves overlap
Heisenberg Uncertainty Principle

impossible to determine simultaneously the position and velocity of electrons or other particles
Aufbau principle

electron occupies lowest energy orbital that can recieve it
Pauli exclusion principle

no more than 2 electrons can occupy the same orbital