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The Bohr Model of the Atom Niels Bohr, a young Danish physicist working in Rutherford’s laboratory in 1913, suggested that the single electron in a hydrogen atom moves around the nucleus in only certain allowed circular orbits.
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The atom looked like a miniature solar system. The nucleus is represented by the sun, and the electrons act like the planets. The Bohr Model of the Atom
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Nucleus Electron Orbit Energy Levels The Bohr Model of the Atom
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The orbits are circular and are at different levels. Amounts of energy separate one level from another. The Bohr Model of the Atom
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Bohr Diagrams 1) Find your element on the periodic table. 2) Determine the number of electrons 3) This is how many electrons you will draw.
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Find out which period (row) your element is in. Elements in the 1 st period have one energy level. Elements in the 2 nd period have two energy levels, and so on. Bohr Diagrams
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1) Draw a nucleus with the element symbol inside. 2) Carbon is in the 2 nd period, so it has two energy levels, or shells. 3) Draw the shells around the nucleus. Bohr Diagrams C C
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1) Add the electrons. 2) Carbon has 6 electrons. 3) The first shell can only hold 2 electrons. Bohr Diagrams C C
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1) The second shell can only hold 8 electrons. 2) The third shell can only hold 18 electrons. Bohr Diagrams C C
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1) Since you have 2 electrons already drawn, you need to add 4 more. 2) These go in the 2 nd shell. 3) Add one at a time - starting on the right side and going counter-clockwise. C C Bohr Diagrams
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Try the following elements on your own: a)H b)He c)O 2- d)Mg 2+ e)Ne f)Ar Bohr Diagrams
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Try the following elements on your own: a)H b)He c)O 2- d)Mg 2+ e)Ne f)Ar H H Bohr Diagrams 1 electron
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Try the following elements on your own: a)H b)He c)O 2- d)Mg 2+ e)Ne f)Ar He Bohr Diagrams 2 electrons
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Try the following elements on your own: a)H b)He c)O 2- d)Mg 2+ e)Ne f)Ar Bohr Diagrams O 2- 10 electrons
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Try the following elements on your own: a)H b)He c)O 2- d)Mg 2+ e)Ne f)Ar Bohr Diagrams Mg 2+ 10 electrons
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Try the following elements on your own: a)H b)He c)O 2- d)Mg 2+ e)Ne f)Ar Bohr Diagrams Ne 10 electrons
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Try the following elements on your own : a)H b)He c)O 2- d)Mg 2+ e)Ne f)Ar Ar Bohr Diagrams 18 electrons
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Electron Dot Diagrams ♦An electron dot diagram illustrates valence electrons as dots (or other small symbols) around the chemical symbol of an element.
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♦Each dot represents one valence electron. ♦In the dot diagram, the element’s symbol represents the core of the atom—the nucleus plus all the inner electrons. Electron Dot Diagrams
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Write the symbol. X ♦Put one dot for each valence electron. ♦Don’t pair electrons up until you have to. Electron Dot Diagrams
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Write a Lewis dot diagram for chlorine. Electron Dot Diagrams
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Write a Lewis dot diagram for calcium. Electron Dot Diagrams
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Write a Lewis dot diagram for potassium. Electron Dot Diagrams
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