group 7

• What do Group Seven elements consist of?

  Molecules with two atoms
• What is another name for Group Seven elements?

  Halogens
• What type of elements are all Group Seven elements?

  Non-metals
• How many electrons do Group Seven elements have in their outer energy level?

  Seven electrons
• Why do atoms react with each other?

  To achieve a full outer energy level
• What is produced when two fluorine atoms react?

  A fluorine molecule, F2
• What is a covalent bond?

  A shared pair of electrons between atoms
• How can we represent a covalent bond visually?

  As a stick between two atoms
• How do the melting and boiling points of Group Seven elements change?

  They increase as we move down the group
• What is the physical state of fluorine and chlorine at room temperature?

  Both are gases
• What is the physical state of bromine at room temperature?

  Liquid
• Why is iodine a solid at room temperature?

  Both melting and boiling points are higher than 20°C
• What does relative molecular mass indicate?

  The size of a molecule
• How does relative molecular mass change down Group Seven?

  It increases as we move down the group
• what colour is fluorine at room temp

  yellow gas
• what colour is chlorine at room temp

  pale yellow-green gas
• what colour is bromine at room temp

  red-brown liquid
• what colour is iodine at room temp

  grey solid
• what are the characteristics of fluorine

  1. very reactive
  2. poisonous gas
• what are the characteristics of chlorine

  1. reactive
  2. poisonous
  3. dense
• what are the characteristics of bromine

  1. volatile liquid
• what are the characteristics of iodine

  1. shimmery
  2. crystalline
  3. forms purple vapour
• what colour is chlorine in solution

  pale green
• what colour is bromine in solution

  orange
• what colour is iodine in solution

  dark brown