To determine the correct chemical formula for an element from Group 13 bonding with an element from Group 17, we need to consider the valencies of the elements involved.
Group 13 elements (e.g., Aluminum, Al) typically have a valency of +3, while Group 17 elements (e.g., Chlorine, Cl, or Bromine, Br) have a valency of -1.
When an element from Group 13 bonds with an element from Group 17, we can use the crisscross method to balance the charges:
- Aluminum (Al) has a charge of +3.
- Chlorine (Cl) has a charge of -1.
To balance these charges, we need three Cl atoms for one Al atom:
- The formula becomes \( AlCl_3 \).
Now let's evaluate the given options:
- A: AlCl3 (Correct formula)
- B: B3I (Incorrect, based on the bonding rules)
- C: BF (Incorrect, based on the bonding rules)
- D: BrGa3 (Incorrect, based on the bonding rules)
Thus, the correct answer is:
A: AlCl3
1 answer