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Atomic Structure: Nucleus and Elements

Learn about the two particles found in the nucleus of an atom and what defines an element. Explore the composition of atoms and the roles of protons, neutrons, and electrons. Discover the energy levels and electron cloud in the current model of atomic structure.

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Atomic Structure: Nucleus and Elements

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  1. DO Now:

  2. Atomic Structure Essential Question: What two particles are found in the nucleus of an atom?

  3. What is an Element? • Definition: Matter that is composed of one type of atom. • Elements are abbreviated in scientific shorthand, either a letter or a pair of letters called chemical symbols. • Ex: Al= Aluminum

  4. Atoms • Definition: Smallest piece of matter that still has the properties of an element.

  5. Atoms Continued… • Parts of an atom: • Proton: positive charged (+) • Neutrons: neutral or no charge • Electrons: negative charged (-) • Nucleus: located in center of atom that consist of protons and neutrons, electrons that surround the nucleus.

  6. Electron Cloud • Current model shows electrons traveling in specific energy levels around a nucleus: electrons closest to the nucleus have low energy. • Electrons farther away have high energy.

  7. The last energy level can only hold a max of 8 electrons with Hydrogen and Helium being an exception.

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