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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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rolfch1p rolfch1p
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10 years ago
I've got trigonal pyramidal, but when I look at the geometric shapes shouldn't it be seesaw?
But ICl4 - has 29 vlence electrons, why wouldn't be a distorted Tetrahedral or seesaw?
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#1
10 years ago
it is tetrahedral, Iodine with 4 chlorides around sp3 hybridized
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#2
10 years ago
ICl4- is square planar; it has the central iodine with 4 equally spaced equatorial chlorines and a lone pair above and below the iodine. The molecule has a grand total of 36 electrons: 3 lone pairs on each chlorine, 2 lone pairs on the central iodine, and 8 bonding electrons.
In this case the iodine has an expanded octet, hence the more than 8 valence electrons.

Formal charge on each chlorine:
7 (neutral) - 1 (bonding) - 6 (lone electrons) = 0

Formal charge on iodine:
7 (neutral) - 4 (bonding) - 4 (lone electrons) = -1
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