Modern Atomic Theory Chapter 4 Section 3.

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Presentation transcript:

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 They are not on one definite path 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 2 3 1+3=4 8 5 1+3+5=9 18 4 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

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