Group 7 - physical properties

• What is the vertical column of non-metal elements next to group 0 in the periodic table called?

  Group 7
• What are the physical properties of elements in the same group of the periodic table?

  They show trends in physical properties, such as boiling point.
• Why do elements in group 7 have similar chemical properties?

  They have the same number of electrons in their outer shell.
• What is the definition of a halogen?

  An element placed in group 7 of the periodic table.
• What does the name 'halogen' mean?

  'Salt-producing' because halogens produce salts when they react with metals.
• What is the state of chlorine at room temperature?

  Gas
• What is the state of bromine at room temperature?

  Liquid
• What is the state of iodine at room temperature?

  Solid
• How do the melting and boiling points of halogens change as you go down group 7?

  The melting and boiling points increase as you go down the group.
• Why do the melting and boiling points of halogens increase down the group?

  The molecules become larger, and the intermolecular forces become stronger.
• What is the melting point of astatine predicted to be?

  About 300°C
• What is the boiling point of astatine predicted to be?

  About 340°C
• What is the predicted state of astatine at room temperature?

  Solid
• What are the physical properties of halogens at room temperature?

  • Chlorine: Pale green gas
  • Bromine: Brown liquid
  • Iodine: Purple-black solid
• What are the trends in physical and chemical properties of halogens?

  • Physical properties: Trends in state and color
  • Chemical properties: Similar reactivity due to outer shell electrons
• What are the definitions of physical and chemical properties?

  • Physical properties: Appearance and behavior without chemical reactions
  • Chemical properties: How a substance reacts with others
• What is the relationship between molecular size and intermolecular forces in halogens?

  • Larger molecules have stronger intermolecular forces
  • More energy is needed to overcome these forces