Key idea
Molecular geometry
Molecular geometry describes the three-dimensional arrangement of atoms. Electron-pair repulsions provide a remarkably useful first model for many main-group molecules.
Molecular geometry
The key idea
Molecular geometry describes the three-dimensional arrangement of atoms. Electron-pair repulsions provide a remarkably useful first model for many main-group molecules.
Why it matters
Shape matters because it influences polarity, intermolecular interactions and ultimately many physical and chemical properties.
A picture to remember
Key idea
Molecular geometry
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Guided example
Molecular geometry
Molecular geometry describes the three-dimensional arrangement of atoms. Electron-pair repulsions provide a remarkably useful first model for many main-group molecules.
Put it into practice
Molecular geometry
Choose a concrete case linked to Molecular geometry. Write down the known information, what you are trying to find, and the units. Then state the rule, model or trend you will use. If a calculation is involved, keep the units visible at every line; if it is conceptual, state what changes and what remains fixed.
Check your answer
A strong answer contains four things: the starting situation, the variable that changes, the direction or numerical result, and one check. The check can be a unit, an order of magnitude, a limiting case or a comparison with a familiar example.