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2 bohr’s model
2 bohr’s model
2 bohr’s model
2 bohr’s model
2 bohr’s model
2 bohr’s model
2 bohr’s model
2 bohr’s model
2 bohr’s model
2 bohr’s model
2 bohr’s model
2 bohr’s model
2 bohr’s model
2 bohr’s model
2 bohr’s model
2 bohr’s model
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2 bohr’s model

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  • 1. Bohr’s Model & Lewis Dot Structure
  • 2.
    • Ex: Boron Boron-10
    • Atomic mass 11 10
    • Atomic # -5 -5
    • # of n o 6 5
    • Boron-10 is the isotope of Boron because it has different # of neutrons.
  • 3.
    • Ex: Hydrogen
    • Atomic mass 1 2 3
    • Atomic # -1 -1 -1
    • # of n o 0n 1n 2n
    ↕ ↕ Isotopes of Hydrogen
  • 4. Isotopes
    • Isotopes - atoms of the same element that have different number of neutrons.
  • 5. Bohr’s Model
    • Bohr’s Model- a diagram that shows where the e - are located on the atom.
  • 6. Steps of Bohr’s Model
    • Write down the atomic number and atomic mass of the element.
    • 2. Calculate the number of protons and electrons (look at the atomic number…..
    • # of p + = # of e - ).
  • 7.
    • 3.Calculate the number of neutrons (Atomic mass-Atomic number).
    • 4. Place the electrons in the energy levels until you run out of electrons (go clockwise).
    • (1 st = 2e - 2 nd = 8e - 3 rd = 8e - )
  • 8.
    • Ex: Carbon
    • Atomic number= 6
    • Atomic mass= 12
    • # of protons= 6
    • # of electrons= 6
    • # of neutrons= 6 (12-6)
    (# p + = # e - ) (Atomic #)
  • 9. C p&n C = 6 e - 1 st = 2 e- 2 nd = 4 e- X X X X X X
  • 10. Your turn
    • Draw the Bohr’s Model for Sodium.
  • 11.
    • Sodium (Na)
    • Atomic number = 11
    • Atomic mass = 23
    • # of protons= 11
    • # of electrons= 11
    • # of neutron = 12
  • 12. Na = 11 e - 1 st = 2 e- 2 nd = 8 e- 3 rd = 1 e- Na X X X X X X X X X X X
  • 13. Lewis Dot Diagram
    • Lewis Dot Diagram- uses the symbol of the element and dots to represent the electrons in the outer energy level (the last level).
  • 14. Lewis Dot Diagram for Carbon
    • Carbon = 6 e -
    • Last energy level (outer energy level e - ) = 4 e -
    • C
    . . . .
  • 15. Your turn….Try Sodium
  • 16. Lewis Dot Diagram for Sodium
    • Sodium = 11 e -
    • Last energy level (outer energy level) e - = 1 e -
    • Na
    .

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