1.11 Group 7

• What are the five elements that make up the halogens group in Group 7 of the periodic table?

  F, Cl, Br, I, At
• The color of halogens ranges from pale yellow for fluorine to dark violet for iodine
• Halogens tend to gain one electron to achieve a stable octet configuration.
• As the atomic radius of halogens increases, their reactivity and electronegativity decrease.


  True
• The reactivity of halogens decreases down the group
• Why does the reactivity of halogens decrease down Group 7?

  Increasing atomic radius
• Order the halogens from most reactive to least reactive

  1️⃣ Fluorine (F)

  2️⃣ Chlorine (Cl)

  3️⃣ Bromine (Br)

  4️⃣ Iodine (I)

  5️⃣ Astatine (At)
• Match the halogen with its state at room temperature:

  Fluorine ↔️ Gas

  Bromine ↔️ Liquid

  Iodine ↔️ Solid
• How many valence electrons do halogens have in their outermost shell?

  7
• Arrange the following properties of halogens in order of their trends down Group 7:

  1️⃣ Atomic Radius

  2️⃣ Reactivity

  3️⃣ Electronegativity
• The atomic radius of halogens increases down the group
• As the atomic radius of halogens increases, the valence electrons become farther from the nucleus
• The most reactive halogen is fluorine, while the least reactive is astatine
• Hydrogen halides have the general formula HX
• Hydrogen fluoride (HF) is the only hydrogen halide with weak acidity
• Halogens have 7 valence electrons in their outermost shell

  True
• Halogens have 7 valence electrons in their outermost shell and gain 1 electron to achieve a stable octet configuration.


  True
• Chlorine gas displaces iodine from sodium iodide in a displacement reaction.


  True
• The reaction between chlorine gas and sodium iodide produces sodium chloride and iodine.
• Hydrogen halides are polar molecules due to the electronegativity difference between hydrogen and halogens.

  True
• The formation of hydrogen halides is an exothermic process

  True
• Hydrogen halides are polar molecules

  True
• Which hydrogen halide has the highest boiling point?

  HF
• The formation of hydrogen halides releases energy

  True
• What is the formula of sodium chloride?

  NaCl
• Hydrogen halides are polar molecules due to the electronegativity difference between hydrogen and halogens


  True
• Halogens are located in Group 7 of the periodic table


  True
• Halogens tend to gain 1 electron to achieve a stable octet
• The atomic size of halogens increases down Group 7 due to the addition of protons and electron shells.
• The electronegativity of halogens increases down Group 7.

  False
• The boiling point of hydrogen halides increases from HCl to HI due to increasing molecular size.
• The reaction for the formation of hydrogen halides is H₂
• Hydrogen halides react with water to form H₃O⁺
• Hydrogen halides form acidic solutions in water

  True
• Halide salts are formed by the reaction of halogens with metals
• Halide salts have diverse applications due to their unique properties


  True
• Halogens are highly reactive because they need to gain one electron to achieve a stable octet configuration.


  True
• The atomic radius of halogens decreases as you move down Group 7 of the periodic table.

  False
• Why does the atomic size of halogens increase down Group 7?

  Additional proton and electron shell
• What happens to the reactivity of halogens as you move down Group 7?

  Decreases