1.2.3 Group 7: Halogens

• Group 7 is located on the right-hand side of the Periodic Table.right-hand
• The last element in Group 7 is Astatine
• What is the state of chlorine at room temperature?

  Gas
• The atomic radius of Group 7 elements increases down the group.


  True
• Group 7 elements become more reactive down the group.

  False
• What is the general term for the elements in Group 7 of the periodic table?

  Halogens
• What is the color of fluorine at room temperature?

  Pale yellow
• Group 7 elements exist as diatomic molecules at room temperature, except for iodine which is a solid.
• All Group 7 elements are gases at room temperature.

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

  Red-brown
• In a halogen displacement reaction, the more reactive halogen displaces the less reactive halogen from its halide compound.
• Arrange the factors contributing to decreasing reactivity in Group 7:

  1️⃣ Increasing atomic size

  2️⃣ The shielding effect
• Group 7 elements are located on the left-hand side of the periodic table.

  False
• Order the halogens by their color, from lightest to darkest:

  1️⃣ Fluorine (pale yellow)

  2️⃣ Chlorine (yellow-green)

  3️⃣ Bromine (red-brown)

  4️⃣ Iodine (dark violet)

  5️⃣ Astatine (black)
• The colors of Group 7 elements become darker as you move down
• Order the halogens by their reactivity, from most reactive to least reactive:

  1️⃣ Fluorine

  2️⃣ Chlorine

  3️⃣ Bromine

  4️⃣ Iodine

  5️⃣ Astatine
• Which halogen is added to toothpaste to prevent cavities?

  Fluorine
• Group 7 elements are all non-metals.

  True
• Order the Group 7 elements from most reactive to least reactive.

  1️⃣ Fluorine

  2️⃣ Chlorine

  3️⃣ Bromine

  4️⃣ Iodine

  5️⃣ Astatine
• At room temperature, Group 7 elements exist as diatomic molecules.
• Which Group 7 element is a solid at room temperature?

  Iodine
• Which Group 7 element has the chemical symbol Cl?

  Chlorine
• Group 7 elements become more reactive down the group.

  False
• What happens to the atomic radius of Group 7 elements as you move down the group?

  Increases
• What is the color of iodine at room temperature?

  Dark violet
• Which Group 7 element has a pale yellow color?

  Fluorine
• The boiling point of iodine is higher than that of chlorine.

  True
• Chlorine is more reactive than fluorine in Group 7.

  False
• Which Group 7 element is the most reactive?

  Fluorine
• The reactivity of Group 7 elements decreases as you move down
• The atomic radius of Group 7 elements increases as you move down
• What do halogens react with metals to form?

  Salts
• What is chlorine commonly used for in water treatment?

  Disinfection
• What is the name of Group 7 elements on the Periodic Table?

  Halogens
• What is the first element in Group 7?

  Fluorine
• Reactivity in Group 7 decreases as you move down the group.

  True
• What color is iodine at room temperature?

  Dark violet
• The color of Group 7 elements ranges from pale yellow (fluorine) to dark violet (iodine).
• The atomic radius of Group 7 elements increases because more electron shells are added.
• Except for iodine, all Group 7 elements exist as diatomic molecules at room temperature.