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What are the possible shapes for molecules of general formula AB₂? - Leaving Cert Chemistry - Question b - 2005
Question b
What are the possible shapes for molecules of general formula AB₂?
Worked Solution & Example Answer:What are the possible shapes for molecules of general formula AB₂? - Leaving Cert Chemistry - Question b - 2005
Step 1
Possible shapes for molecules of general formula AB₂
Answer
Molecules with the general formula AB₂ can have the following shapes:
1. Linear/Straight
The linear shape occurs when the two B atoms are arranged opposite each other around the central A atom, leading to a 180-degree bond angle.
2. Bent/Angular
A bent or angular shape is typically observed when there are lone pairs on the central atom A, which repel the bonding pairs, causing the B atoms to be at an angle less than 180 degrees.
3. V-shape
In some cases, specifically when there are two bonded atoms and one lone pair, the molecule can exhibit a V-shape which displays a specific bond angle, usually around 120 degrees.