MODERN ATOMIC THEORY Chapter 4 Section 3. Modern Atomic Theory Electrons can be found only in...
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Transcript of MODERN ATOMIC THEORY Chapter 4 Section 3. Modern Atomic Theory Electrons can be found only in...
MODERN ATOMIC THEORY
Chapter 4 Section 3
Modern Atomic Theory
Electrons can be found only in certain energy levels, not between levels
The location of electrons cannot be predicted precisely
Electrons
Electrons act like waves waves on a vibrating string
They are not on one definite path
Exact location cannot be determined
Orbital
A region in an atom where there is high probability of finding electrons.
4 types of orbitals
S, P,D,F
Energy Level
Number of orbitals by type
Total Number of orbitals
Total number of Electrons
S P D f
X 2
1 1 1=1 2
2 1 3 1+3=4 8
3 1 3 5 1+3+5=9 18
4 1 3 5 7 1+3+5+7=16
32
Energy Levels
Many possible energy levels
The number of energy levels that are filled depends on the number of electrons
Valence Electrons
Electrons in the outer energy level of an atom
They determine the chemical properties of an atom
Electron Transitions
Electrons jump between energy levels when an atom gains or loses energy
Photon
A unit or quantum of light
Photons of light have different energies
When an electron absorbs a photon it gains energy
Atoms absorb or emit light at certain wavelengths
Energy of a photon is related to the wavelength of the light.
Each element emits a different wavelength due to its atomic structure