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Electrons

This article explores the concepts of ground state and excited state electrons. Ground state electrons possess the lowest possible energy and are located close to the nucleus. In contrast, excited state electrons absorb energy, moving farther from the nucleus. When these excited electrons return to their ground state, they emit a photon of energy, resulting in a specific wavelength. Photons within the range of 400nm to 700nm can be perceived by our eyes as visible light. The energy of a photon can be calculated using the formula E=hν, where E is energy, h is Planck’s constant, and ν is frequency.

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Electrons

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  1. Electrons • Ground state electrons • lowest possible energy • as close to nucleus as possible • Excited state electrons • have absorbed energy (not lowest) • moved farther from the nucleus

  2. Light • Excited electrons emit (lose) a photon of energy to become ground state electrons. • The emitted energy has a specific wavelength. • If the wavelength falls within the range of 400nm to 700nm (400x10-9m 700x10-9m) our eyes think it is something special.

  3. Calculating energy of a photon Frequency of a wave can be used to calculate energy. E=hν E= energy (Joules, J) h= Plank’s constant (Joule-seconds, Js) 6.62x10-34 v= frequency (cycles per second, 1/s

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