1.2.1 Arranging the Elements

• The columns of the periodic table are called?

  Groups.
• The rows of the periodic table are called?

  Periods.
• Are elements in the same group similar or different?

  They may have similar chemical properties, as they have the same number of outer shell electrons.
• In terms of energy levels, what are the differences between elements of the same period?

  They have the same number of energy levels.
• Electrons occupy particular energy levels, with each electron in an atom at a particular energy level; which available energy level do electrons occupy?

  The lowest available energy level.
• What makes the periodic table periodic?

  Similar properties of elements occur at regular intervals.
• Elements in the same group have the same number of electrons in their outer shell; what does this tell us about their chemical properties?

  They have similar chemical properties.
• In terms of shells, what is the difference between elements in the same period?

  They have the same number of shells.
• What change in shell number is seen as one moves down a group?

  The number of shells increases.