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2. With five electron groups, expect trigonal-bipyramidal electron- group arrangement.
3. All groups/bonded atoms are identical; expect ideal bond angles: 120° for equatorial groups and 90° between axial and equatorial.
4. Shape: AX 5 gives the trigonal bipyramidal shape:
(b) For BrF5 . 1. Lewis structure:
2. With 6 electron groups: octahedral electron-group arrangement.
3. Bond angles: The lone pair should make some F-Br-F bond angles smaller than the ideal 90°.
4. One lone pair and five bonding pairs, AX 5E, give the square pyramidal shape:
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