Atomic Structure

Chemistry

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  • Created by: Gaby
  • Created on: 21-12-10 16:43

Protons, Neutrons and Electrons

               Charge         Mass

Proton      1+                 1.0

Neutron     1-                  1.0

Electron     0                  1/2000

  • Protons and neutrons make up the nucleus
  • Electrons orbit the nucleus in shells (energy levels)
  • Nucleus is tiny compared to the volume of the atom
  • Nucleus is extremely dense. makes up most of mass
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Isotopes

atoms of the same element with

Mass

  • number of neutrons in the nucleus
  •  

Same

  • number of protons
  • number of electrons

Different isotopes of an element react in the same way. Because:

  • chemical reactions involve electrons
  • neutrons make no difference in chemical reactivity
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Atomic structure of ions

Atom: Al (13)

  • Atomic no. -- 13
  • Mass no. -- 27
  • Protons -- 13
  • Neutrons -- 14
  • Electrons -- 13
  • Charge -- 0

Ion: Al 3- (10)

  •  
    • Atomic no. -- 10
    • Mass no. -- 27
    • Protons -- 13
    • Neutrons -- 14
    • Electrons -- 10
    • Charge -- 3-
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