Physical properties of Period 2 elements

• What is the name of group 2 in the periodic table?

  Alkaline earth metals
• Why do elements in group 2 have similar chemical properties?

  They have the same number of valence electrons
• What is the trend in atomic radius going down group 2?

  Atomic radius increases down the group
• What is the trend in first ionisation energy going down group 2?

  First ionisation energy decreases down the group
• What is the trend in melting point going down group 2?

  Melting point generally decreases down the group
• Why does melting point generally decrease as you go down group 2?

  Weaker attraction between cations and electrons
• What does the phrase "charge density" mean?

  Charge per unit volume of an ion
• What block of the periodic table is Ba in?

  Block s
• What is the electron configuration of Mg?

  1s² 2s² 2p⁶ 3s²
• Describe the structure of Ca.

  It has a giant metallic lattice structure
• Name three properties of calcium (Ca).

  Metallic, reactive, and has high melting point
• What is the oxidation number of Ba?

  +2
• What is the oxidation number of Ba**?

  +2
• What dictates whether or not a substance dissolves in a solvent?

  Polarity and intermolecular forces
• What are the physical properties of group 2 metals?

  • Alkaline earth metals
  • Decreasing ionisation energy down the group
  • Decreasing electronegativity down the group
  • Giant metallic lattice structure
  • Charge density decreases down the group
  • Melting point decreases down the group
• What is the trend of charge density in group 2 metals?

  • Charge remains the same
  • Ions get larger due to shielding
  • Charge density decreases down the group
• What is the relationship between charge density and metallic bonding in group 2 metals?

  • Higher charge density = stronger metallic bonding
  • Lower charge density = weaker metallic bonding
  • Charge density decreases down the group