C1

• Number of protons

  • determines element
• Atomic number (bottom)

  • number of protons
• Isotope

  • different forms of an element, same number of protons but different number of neutrons
  • Chemically react in the same way
• Atomic mass (abundance) 


  (isotope abundance x isotope mass) + (isotope abundance x isotope mass) / sum of abundance of isotope
• Proton, Mass: 1 Charge: +1

  Neutron, Mass: 1 Charge: 0

  Electron, Mass: 0.0005 Charge: -1
• Period- electron shells (rows)

  Group- similar chemical properties (columns)
• charge on periodic table in order from L to R

  +1, +2, transition metals, +3, +4/-4, -3, -2, -1, 0