Molecular shapes - Bonding pair / Lone pair repulsion
| Element | Dot and cross diagram | No. Bonding pairs | No. Lone pairs | Total No. pairs | Bond angle (leave until the end) |
| Carbon, CH4 |
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| Nitrogen, NH3 |
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| Oxygen, H2O |
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To do / answer:
Draw the dot and cross diagrams of the hydrides of carbon, CH4, nitrogen, NH3, and oxygen, H2O.
Complete the rest of the table except for the last column.
How many total No of pairs do each of these molecules have?
Construct each of the molecules using the molymods.
Hydrogen is white.
Make sure you pick the correct central model (see Q3)
Use long plastic bonds for bonding pair electrons.
Use short plastic bonds for lone pair electrons.
Which types of pairs of electrons are closest to the central atom?
Which types of pairs of electrons will repel the most?
What effect do you think this will have on the bond angle?