Atomic Structure

• Proton


  Charge of +1 and mass of 1
• Neutron


  Charge of 0 and mass of 1
• Electron

  Charge of -1 and negligible mass
• Distribution of charge and mass in an atom

  Nucleus has overall positive charge and majority of mass, electrons orbit around the nucleus via electrostatic attraction
• Isotope


  Sane number of protons, different number of neutrons
• Relative isotopic mass

  Mass compared with 1/12th mass of carbon-12
• Relative atomic mass


  The weighted mean mass of an atom of an element compared with 1/12th of the mass of a carbon-12 atom
• How to calculate relative isotopic mass from abundances of its isotopes

  (Mass x %) x ..../ 100
• Relative molecular mass


  The weighted mean mass of a molecule of a compound compared with 1/12th of a carbon-12 atom
• Relative formula mass

  The weighted mean mass of the formula unit of a compound compared with 1/12th of a carbon-12 atom
• Nitrate ion


  NO3-
• Carbonate ion


  CO3 2-
• Hydroxide ion


  OH-
• Ammonium ion


  NH4+
• Zinc ion


  Zn2+
• Silver ion


  Ag+