8.3 Group VII Properties
Click on any question below to reveal the interactive flashcard answer key:
13. Name the three Group VII halogens mentioned in the syllabus and state their molecular nature.
The elements are chlorine, bromine, and iodine. They naturally exist as covalent diatomic molecules (Cl2, Br2, I2).
14. What is the general trend for density as you move down Group VII?
The density consistently increases as you travel down Group VII elements.
15. Describe the general trend for reactivity as you move down the elements in Group VII.
Chemical reactivity decreases down the group. As atomic radii expand, the attractive pull from the positive nucleus grows weaker, making it harder to capture an incoming electron.
16. State the appearance of chlorine at room temperature and pressure (r.t.p.).
Chlorine is a pale yellow-green gas.
17. State the appearance of bromine at room temperature and pressure (r.t.p.).
Bromine is a volatile, hazardous red-brown liquid.
18. State the appearance of iodine at room temperature and pressure (r.t.p.).
Iodine is a shiny grey-black solid that sublimes into a purple vapor when warmed.
19. Describe and explain the displacement reactions that occur with halogens and other halide ions.
A more reactive halogen will displace a less reactive halogen from an aqueous solution of its halide ions.
Example: Cl2(aq) + 2KBr(aq) → 2KCl(aq) + Br2(aq)
Example: Cl2(aq) + 2KBr(aq) → 2KCl(aq) + Br2(aq)
20. What should you be able to do if given information about specific elements in Group VII?
You should be able to project trends to identify parameters for other members like fluorine (F2) or astatine (At2).