Group 1 - physical properties

• What is the first vertical column of elements in the periodic table called?

  Group 1
• What are the alkali metals in Group 1 known for?

  They have similar physical and chemical properties.
• Which element is at the top of Group 1 in the periodic table?

  Lithium
• Which element is at the bottom of Group 1 in the periodic table?

  Francium
• What is a physical property?

  A description of the appearance or behavior of a substance without involving chemical reactions.
• What are some physical properties of alkali metals?

  They are soft, have relatively low melting points, and low densities.
• How does the melting point change in Group 1 as you go down the group?

  • The melting point decreases as you move down Group 1.
  • Example: Lithium has a melting point of 180°C, while Caesium has a melting point of 28°C.
• What is the predicted melting point of francium based on its position in the periodic table?

  23-27°C
• Why is the melting point of francium predicted to be lower than that of caesium?

  Because melting point decreases going from one element down to the next in Group 1.
• What are the key trends in physical properties of elements in Group 1?

  • Similar chemical properties due to the same number of outer shell electrons.
  • Decreasing melting points as you move down the group.
  • Softness increases down the group.