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Friday, September 12 Element Quiz 1 Today Extra Credit Prototype due today Element Quiz 2 Thursday Atomic Structure Test Friday 19th
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Electron Shells (Energy Levels) ElectronsElectrons in atoms are in shells The maximum number of electrons in each shell, going from the middle to the outside, is 2-8-8-18atoms
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11 12 Sodium Atomic number = Mass Number = 2 - 8 - 1 p+p+ n 23 11 23 protons & neutrons 12 neutrons In a neutral sodium atom the number of protons (11) = the number of electrons (11) - 11 protons ____________________
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4 5 Beryllium Atomic number = Mass Number = 2 - 2 p+p+ n 9 4 9 protons & neutrons 5 neutrons In a neutral beryllium atom the number of protons (4) = the number of electrons (4) - 4 protons ____________________
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16 Sulfur Atomic number = Mass Number = 2 - 8 - 6 p+p+ n 32 16 32 protons & neutrons 16 neutrons In a neutral sulfur atom the number of protons (16) = the number of electrons (16) - 16 protons ____________________
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7 7 Nitrogen Atomic number = Mass Number = 2 - 5 p+p+ n 14 7 14 protons & neutrons 7 neutrons In a neutral nitrogen atom the number of protons (7) = the number of electrons (7) - 7 protons ____________________
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14 Silicon Atomic number = Mass Number = 2 - 8 - 4 p+p+ n 28 14 28 protons & neutrons 14 neutrons In a neutral silicon atom the number of protons (14)= the number of electrons (14) - 14 protons ____________________
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19 20 Potassium Atomic number = Mass Number = 2 - 8 - 8- 1 p+p+ n 39 19 39 protons & neutrons 20 neutrons In a neutral potassium atom the number of protons (19) = the number of electrons (19) - 19 protons ____________________
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