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Electrons. and the Bohr Model. Neils Bohr. Neils Bohr was convinced that the atom could be pictured as a small positive nucleus with electrons orbiting around it as the planets orbit the sun. The Bohr Model.
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Electrons and the Bohr Model
Neils Bohr • Neils Bohr was convinced that the atom could be pictured as a small positive nucleus with electrons orbiting around it as the planets orbit the sun.
The Bohr Model • Neils Bohr pictured the electron moving in circular orbits corresponding to the various allowed energy levels.
Bohr proved incorrect • Although the Bohr model paved the way for later theories, it is important to realize that the current theory of atomic structure is not the same as the Bohr model. • Electrons do NOT move around the nucleus in circular orbits like planets orbiting the sun. • Bohr’s model is useful (in the chemistry classroom) for picturing the electrons present in an atom.
The Bohr Model – in use • The Bohr model does NOT focus on the nucleus, but rather on the electrons. • The electrons are first placed on the innermost electron shell or energy level. • Two electrons can fit in this level.
The Bohr Model – in use (cont.) • The electrons are then placed on the second electron shell or energy level. • Eight electrons can fit in this level. • The electrons are then placed on the third electron shell or energy level. • 18 electrons can fit in this level.
The Bohr Model – in use (cont.) • Electrons are represented by dots. • Electrons are usually placed singly at first and then doubly. • Example: Sodium
Let’s try one… • Example: Sulfur