- Analyzing structure A, A appears to have 4 groups attached on the central atom.
- So this will have
**4 electron groups**which are**all bonding groups**. - This structure is
**tetrahedral**(A is central atom, X is the substituents)**AX**_{4}

- B appears to be a T-shaped molecule with 3 groups on it but AX
_{3 }doesnt follow a T-shape geometry. AX_{3}follows a trigonal planar geometry.

The following figures show several molecular geometries.

Give the number of total electron groups, the number of bonding groups, and the number of lone pairs for (a) geometry.

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