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# 2 bohr’s model

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### Transcript

• 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
• 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
. . . .