
Have you finished your task on BeCl2 molecules? Its OK, do that task first, before moving the next task.
When you finish explaining BeCl2 molecule and you realise that molecule is non polar, so how about CH4 and BF3? Are they non polar molecules too? Very good, well done.
Here, the picture of BF3 molecule. What the reason is? There are 3 bonding pairs and no lone pair, so it is a symmetrical molecule, the dipole moment of it is zero. No dipole at all.
Yes, good point. How about CH4 molecule? Why this molecule is also a non polar molecule? As same as BeCl2 and BF3 molecules, there is no lone pair electron, it has 4 bonding pairs, so this is a symmetrical molecule too.
Please read your paragraphs, is there any explanation about dipole moment or symmetrical molecules in your task? OK, you can add some points from this discussion to complete it. After that you can go on to the next task, that is a polar molecule.
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