1.11 Group 7

• What is the appearance of iodine at room temperature?

  Shiny, purple-black solid
• What is the most common oxidation state of halogens?

  -1
• Order the halogens from most reactive to least reactive:

  1️⃣ Fluorine

  2️⃣ Chlorine

  3️⃣ Bromine

  4️⃣ Iodine
• The reactivity of halogens decreases down the group due to decreasing electronegativity.
• Fluorine has the highest electronegativity and the smallest atomic size.
• Arrange the halogens in order of increasing reactivity.

  1️⃣ Iodine (I)

  2️⃣ Bromine (Br)

  3️⃣ Chlorine (Cl)

  4️⃣ Fluorine (F)
• Which halogen has the highest electronegativity?

  Fluorine
• What is the chemical formula for sodium chloride?

  NaCl
• Halogens become less reactive and change state from gases to solids as you move down Group 7.
• Fluorine's high electronegativity makes it highly reactive.

  True
• Which halogen is the least reactive?

  Iodine
• Arrange the halogens in order of increasing reactivity:

  1️⃣ Iodine (I)

  2️⃣ Bromine (Br)

  3️⃣ Chlorine (Cl)

  4️⃣ Fluorine (F)
• Match the halogen with its electronegativity trend:

  Fluorine ↔️ Highest electronegativity

  Iodine ↔️ Lowest electronegativity

  Chlorine ↔️ High electronegativity

  Bromine ↔️ Moderate electronegativity
• Fluorine is used in the production of fluorocarbons like Teflon
• Fluorine and chlorine are gases at room temperature.


  True
• Fluorine is the most reactive halogen in Group 7.

  True
• Halogens form stable halide ions when they react with other elements.
• Bromine is a liquid at room temperature.


  True
• What does electronegativity measure?

  Ability to attract electrons
• What are the products of the reaction between chlorine gas and sodium?

  Sodium chloride
• Fluorine's small atomic size and tightly held electrons contribute to its high reactivity.


  True
• Halogens react to form stable halide ions.
• Which halogen is radioactive and has limited practical applications?

  Astatine
• What is the most common oxidation state of halogens?

  -1
• Fluorine's small atomic size and tightly held electrons contribute to its high reactivity.


  True
• Chlorine gas reacts with sodium to form sodium chloride
• Fluorine has the highest electronegativity, making it the most reactive halogen.

  True
• Halogens are more reactive than other groups in the periodic table because they have high electronegativity.

  True
• Smaller atomic size leads to greater attraction for outer electrons, increasing reactivity.


  True
• Within Group 7, reactivity decreases as electronegativity decreases
• Chlorine is used in water treatment to kill bacteria
• The Group 7 elements are also known as the halogens
• The physical properties of Group 7 elements vary due to increasing atomic size
• Match the halogen with its property:

  Fluorine ↔️ Most reactive

  Iodine ↔️ Purple-black solid

  Bromine ↔️ Reddish-brown liquid
• Halide ions are less reactive than their parent halogen atoms.

  True
• Electronegativity measures an atom's ability to attract electrons
• Which halogen has the largest atomic size?

  Iodine
• Match the halogen with its example use:

  Fluorine ↔️ Water fluoridation

  Chlorine ↔️ Water treatment

  Bromine ↔️ Flame retardants

  Iodine ↔️ Treatment for thyroid disorders
• Bromine is a liquid at room temperature.


  True
• Iodine's larger atomic size reduces its ability to attract electrons.