6.2 Group 7: The Halogens

• The halogens are highly reactive nonmetal elements.


  True
• What are the five elements that make up the halogens?

  F, Cl, Br, I, At
• What is the state of chlorine at room temperature?

  Gas
• What is the atomic number of iodine?

  53
• The halogens are located in Group 7 (or 17) of the periodic table.
• What is the color of chlorine at room temperature?

  Greenish-yellow
• What is the trend in electronegativity of the halogens down the group?

  Decreasing electronegativity
• Electronegativity measures an element's ability to attract shared electrons
• What type of compounds do halogens form with metals?

  Ionic halides
• Match the halogen with its property:

  Fluorine ↔️ Most reactive

  Chlorine ↔️ Greenish-yellow gas

  Bromine ↔️ Liquid at room temperature

  Iodine ↔️ Purple solid

  Astatine ↔️ Radioactive
• The atomic number of iodine is 53
• Arrange the halogens in order of decreasing reactivity:

  1️⃣ Fluorine

  2️⃣ Chlorine

  3️⃣ Bromine

  4️⃣ Iodine

  5️⃣ Astatine
• Fluorine is highly reactive due to its high electronegativity
• What types of compounds do halogens form?

  Ionic, covalent, and hydrogen
• Fluorine has the highest electronegativity among the halogens.


  True
• The halogens exhibit a decreasing reactivity trend due to increasing atomic size
• What happens when chlorine reacts with sodium bromide (NaBr)?

  Bromine is displaced
• Match the halogen with its symbol:

  Fluorine ↔️ F

  Chlorine ↔️ Cl

  Bromine ↔️ Br

  Iodine ↔️ I
• At room temperature, bromine exists as a liquid
• Match the halogen with its atomic number:

  Fluorine ↔️ 9

  Chlorine ↔️ 17

  Bromine ↔️ 35

  Iodine ↔️ 53
• The halogens exhibit a decreasing electronegativity trend down the group.

  True
• What is the primary reason for the decreasing reactivity trend in Group 7 as you move down the periodic table?

  Increasing atomic size
• Fluorine has the highest electronegativity in Group 7 and is therefore the most reactive.

  True
• Which halogen forms the strongest and most stable ionic and covalent compounds?

  Fluorine
• Match each halogen with its typical compound:

  Fluorine ↔️ NaCl

  Chlorine ↔️ KCl

  Bromine ↔️ NaBr

  Iodine ↔️ KI

  Astatine ↔️ RbAt
• A more reactive halogen can displace a less reactive halogen from its compound.


  True
• Displacement reactions of halogens are used in water purification and halogen extraction
• The halogens are important in industrial, medical, and consumer applications.


  True
• Iodine is used to treat thyroid disorders
• What are the halogens in the periodic table called?

  Group 7
• Arrange the halogens in order of decreasing reactivity, from most reactive to least reactive.

  1️⃣ Fluorine

  2️⃣ Chlorine

  3️⃣ Bromine

  4️⃣ Iodine

  5️⃣ Astatine
• The halogens are located in Group 7 of the periodic table.


  True
• What is the color of bromine at room temperature?

  Reddish-brown
• Astatine is the least reactive halogen and is highly radioactive.


  True
• The reactivity of halogens decreases down the group due to increasing atomic size.


  True
• What is the main reason for the decreasing reactivity of halogens down the group?

  Decreasing electronegativity
• Halogens react with hydrogen to form hydrogen halides.
• Fluorine has the highest electronegativity among the halogens.


  True
• Halogens react with hydrogen to form hydrogen halides
• What is the most reactive halogen in the group?

  Fluorine