6.2 Group 7: The Halogens

• What are Group 7 elements also known as?

  Halogens
• Which halogen is a gas at room temperature and has a pale yellow color?

  Fluorine
• Iodine is a solid at room temperature with a dark purple color.


  True
• What is the odor of fluorine described as?

  Pungent, acrid
• Halogens are excellent oxidizing agents because they readily gain electrons.


  True
• The decrease in reactivity of halogens is due to the outermost electrons being further from the nucleus
• Match the halogen with its state at room temperature:

  Fluorine ↔️ Gas

  Bromine ↔️ Liquid

  Iodine ↔️ Solid
• Match the halogen with its correct odor:

  Chlorine ↔️ Sharp, irritating

  Bromine ↔️ Suffocating

  Iodine ↔️ Sharp
• What is the balanced chemical equation for the reaction between sodium and chlorine?

  2Na + Cl₂ → 2NaCl
• In the reaction Cl₂ + 2KI → 2KCl + I₂, chlorine displaces iodine
• As halogens get larger, their outermost electrons are further from the nucleus
• Halogens react with non-metals to form covalent compounds
• Halogens react with non-metals to form covalent compounds
• Arrange the halogens in order of decreasing reactivity:

  1️⃣ Fluorine

  2️⃣ Chlorine

  3️⃣ Bromine

  4️⃣ Iodine
• What are the four halogens mentioned in the study material?

  F, Cl, Br, I
• The odor of fluorine is described as pungent and acrid
• Arrange the halogens in order of their ability to displace each other from halide salts (most reactive to least reactive):

  1️⃣ Fluorine

  2️⃣ Chlorine

  3️⃣ Bromine

  4️⃣ Iodine
• Match the chemical property with its explanation or example:

  High Reactivity ↔️ Halogens readily react with metals

  Formation of Halide Ions ↔️ Halogens gain one electron

  Displacement Reactions ↔️ More reactive halogens displace less reactive ones
• Why does the reactivity of halogens decrease down Group 7?

  Increasing atomic size
• The halogens' ability to attract an electron and form a stable halide ion diminishes
• Arrange the halogens in order of decreasing reactivity:

  1️⃣ Fluorine

  2️⃣ Chlorine

  3️⃣ Bromine

  4️⃣ Iodine
• Halogens form halides when reacting with metals.

  True
• Which halogen is a liquid at room temperature with a red-brown color?

  Bromine
• The reactivity of halogens decreases as you go down the group.
• Which halogen has a suffocating odor?

  Bromine
• The reaction between sodium and chlorine produces sodium chloride
• Why does the reactivity of halogens decrease down the group?

  Atomic size increases
• Match the halogen with its odor:

  Fluorine ↔️ Pungent, acrid

  Chlorine ↔️ Sharp, irritating

  Bromine ↔️ Suffocating

  Iodine ↔️ Sharp
• Bromine is a red-brown liquid at room temperature

  True
• Halogens react with metals to form halides
• The reactivity of halogens increases as you move down Group 7

  False
• What is the general reaction between a metal and a halogen?

  Metal + Halogen → Metal Halide
• When hydrogen reacts with chlorine, the compound formed is hydrogen chloride
• Match the halogen with its chemical symbol:

  Fluorine ↔️ F

  Chlorine ↔️ Cl

  Bromine ↔️ Br

  Iodine ↔️ I
• Bromine is a liquid at room temperature and its color is red-brown.


  True
• When halogens react with metals, they form salts called halides
• Chlorine displaces iodine because chlorine is more reactive than iodine.


  True
• Arrange the halogens in order of decreasing atomic size:

  1️⃣ Iodine

  2️⃣ Bromine

  3️⃣ Chlorine

  4️⃣ Fluorine
• Halogens' ability to attract an electron decreases as they increase in atomic size.


  True
• Match the halogen with its atomic size:

  Fluorine ↔️ Smallest

  Chlorine ↔️ Small

  Bromine ↔️ Large

  Iodine ↔️ Largest