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Delve into the fascinating world of energy levels of electrons, as seen through line spectra and Niels Bohr's model. Understand how electrons absorb and emit energy, transitioning between different shells in atoms. Explore the concept of energy gain and loss in electron movements within elements like hydrogen, unraveling the mysteries of atomic structures.
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Energy of Electrons • observation When atoms are heated, bright lines appear through a prism called line spectra • Bohr’s explanation Electrons in atoms arranged in discrete or distinct levels. An electron absorbs energy to “jump” to a higher energy level. When an electron falls to a lower energy level, energy is emitted.
Loss and Gain of Energy Loss G a I n
Learning Check Answer with 1) Energy absorbed 2) Energy emitted 3) No change in energy A. What energy change takes place when an electron in a hydrogen atom moves from the first (n=1) to the second shell (n=2)? Energy absorbed
Learning Check Answer with 1) Energy absorbed 2) Energy emitted 3) No change in energy B. What energy change takes place when the electron moves from the third shell to the second shell? Energy emitted
Niels Bohr’s Model • He had a question: Why don’t the electrons fall into the nucleus? • Move like planets around the sun. • In circular orbits at different energy levels. • “Planetary model”
Bohr’s Model Nucleus Electron Orbit Energy Levels
