Subatomic Particles

• Proton

  Charge: Positive

  Mass in g: 1.6726 x 10-24

  amu: 1.0073
• Neutron

  Charge: Neutral

  Mass in g: 1.675 x 10-24

  amu: 1.0087
• Electron

  Charge: Negative

  Mass in g: 9.10938 x 10-28

  amu: 5.486 x 10-4
• Protons

  • Gives identity to the element
  • Mass number
  • No two element has the same number of protons
• Nucleons

  • Proton and Neutron
  • Not affected by the chemical reaction/bonding
• Element (X)


  A pure substance that cannot be decomposed into simpler substance.
• Mass Number (A)

  Protons + Neutrons
• Atomic Number (Z)


  Protons (defines the element)
• Charge (Q)

  Protons - Electrons
• Isotopes

  • Similar Proton, Different Neutron
• Isotones

  • Same Neutron, Different Proton
• Isobars

  • Same Mass Number
  • Different Atomic Number