KES notes

• How are elements classified in the periodic table?

  As s, p, or d block
• What determines the block classification of an element?

  The orbitals of the highest energy electrons
• What happens to atomic radii across a period?

  They decrease from left to right
• Why do atomic radii decrease across a period?

  Increased protons create stronger attraction for electrons
• What is periodicity in chemistry?

  A repeating pattern across different periods
• What properties display periodicity?

  Atomic radius, melting points, boiling points, ionisation energy
• How are elements arranged in the periodic table?

  In increasing atomic number
• What do elements in the same group have in common?

  Similar physical and chemical properties
• What causes similar chemical properties in elements of a group?

  Similar outer shell electron configurations
• List the elements in Period 2.

  Li, Be, B, C, N, O, F, Ne