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# 2 bohr’s model

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### 2 bohr’s model

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