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Pre – AP Physical Science

Learn about the principles of electrons occupying energy levels, Aufbau Principle, and two methods for writing electron configurations. Explore spdf and Orbital Box notations for hydrogen and helium, as well as the Octet Rule and Valence Electrons concept.

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Pre – AP Physical Science

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  1. Pre – AP Physical Science Bond Types

  2. Basic Principle: electrons occupy lowest energy levels available

  3. Aufbau Principle – “Diagonal Rule”

  4. 2 ways to write electron configurations 1) spdf Notation spdf NOTATION for H, atomic number = 1 1 no. of electrons s 1 sublevel value of energy level Orbital Box Notation ORBITAL BOX NOTATION for He, atomic number = 2 Arrows show electron spin 2  1s 1s

  5. The Octet RuleAtoms tend to gain, lose or share electrons until they are surrounded by eight valence electrons.

  6. Valence ElectronsValence electrons are found in the incomplete outermost shell of an atom.

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