Section 4-1 Continued.  Ground State – the lowest energy state of an atom  Excited State – a state in which an atom has a higher energy than in its.

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Presentation transcript:

Section 4-1 Continued

 Ground State – the lowest energy state of an atom  Excited State – a state in which an atom has a higher energy than in its ground state. When an excited atom returns to its ground state, it gives off the energy it gained in the form of electromagnetic radiation.

 Line-Emission Spectrum – a series of specific wavelengths (colors) of emitted light created when the visible portion of light from excited atoms is released.

Continuous Spectrum  The continuous range of frequencies of electromagnetic radiation. (Shows all colors of light).

Bohr’s Model of the Atom  His model states that electrons can only circle the nucleus in allowed paths or orbits. Energy of an electron is higher when it is further away from the nucleus.

Section 4-2 The Quantum Model of the Atom  Electrons have wavelike properties as well as particle properties.

Heisenberg’s Uncertainty Principle  States that it is impossible to determine both the position and velocity of an electron.  An orbital is a 3D region around the nucleus that shows the region where the electron is probably located.