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Chemistry: Inside the Atom

E-. E-. Chemistry: Inside the Atom. E-. E-. Part 3: The Electron. E-. E-. Electron Arrangement. Remember in a neutral atom there are the same number of electrons as protons!!! Electrons : Travel around the nucleus in paths called orbits (they are negatively charged)

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Chemistry: Inside the Atom

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  1. E- E- Chemistry: Inside the Atom E- E- Part 3: The Electron E- E-

  2. Electron Arrangement • Remember in a neutral atom there are the same number of electrons as protons!!! • Electrons: Travel around the nucleus in paths called orbits (they are negatively charged) • All the electron paths put together make and electron shell (electron cloud)

  3. Electron Arrangement • Bohr Model Nucleus 1 P 0 N Electron Electron Shell

  4. Bohr Model • This model focuses on the electrons: • Electrons move in paths around the nucleus of the atom called Energy Levels. • Electrons are found ON energy levels • The farther the energy level from the nucleus, the greater the energy of the electrons there.

  5. Bohr Model Continued… • Atoms can give off or absorb energy • Electrons can move from 1 energy Level to another • Adding energy (absorbing) = Electrons moving farther from the nucleus • Giving off energy = Electrons moving closer to the nucleus.

  6. Bohr Model Adding Energy- Electrons moving farther from the nucleus Nucleus ELECTRON

  7. Bohr Model Giving Off Energy- Electrons moving closer to the nucleus Nucleus ELECTRON

  8. Electron Shells Example: The element Nitrogen is in the 2nd period so it has two electron shells

  9. Electron Shells • These shells are represented with a letter • K through Q • Look at diagram on the board • Each Electron shell can hold only a certain number of electrons:

  10. Inner and Outer Shells • A “K” shell is complete when it has 2 Electrons. A “L” shell is complete when it has 8 electrons. • “M” and “N” shells can hold 18 and 32 electrons when they are inner shells. When an “M” or “N” shell is an outer shell it can hold only 8 electrons. • An outer shell can never hold more than 8 electrons. • The electrons in the outer shell are called Valence Electrons

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