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Atoms and the periodic Table

Atoms and the periodic Table. Chapter 4. Atomic structure. Atoms are: The building blocks of molecules. Definition-”unable to be divided”~Greek Our conceptual model based on John Daltons 1808 theory. What is an atom?. Made of protons, neutrons, and electrons.

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Atoms and the periodic Table

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  1. Atoms and the periodic Table Chapter 4

  2. Atomic structure Atoms are: • The building blocks of molecules. • Definition-”unable to be divided”~Greek • Our conceptual model based on John Daltons 1808 theory.

  3. What is an atom? • Made of protons, neutrons, and electrons. • The center is called the nucleus. • We think that electrons move around the nucleus in a mini-cloud. • Protons (positive charge) • Neutron (neutral or no charge) • Electrons (negative charge)

  4. Bohrs model • Compares atoms to planets. • 1913 • Each planet would be a “layer” of electrons.

  5. Periodic Table • Groups similar elements together. • Atomic number=the number of protons. • Mass number=the number of protons+neutrons

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