Periodic table

Cards (4)

  • Mendeleev
    Arranged the elements by atomic mass
    Left gaps for undiscovered elements
  • Modern periodic table
    In order of atomic nymber
    Metals on the left
    Non-metals on the right
  • Columns
    Show the groups. The group number shows the number of electrons in the outer shell.
  • Rows
    The periods show the number of electron shells an element will have.