It depends on the hybridization of the central atom.
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∙ 2012-05-29 14:48:47Tetrahedral
The molecular shape of IOF3 is a "seesaw". The central atom has 1 lone pair of electrons and at the same time has 4 bonds
This is a trigonal pyramidal molecule.
Carbon dioxide, CO2, is a linear molecule with double bonds between each oxygen atom and the central carbon atom, O=C=O.
The CO2 molecule is linear. The central carbon atom forms a double bond with each oxygen atom. For an illustration, go to the related link below.
linear
In a water molecule, there are two lone pairs of electrons connected to the oxygen. The lone pairs push the hydrogen atoms, creating a bent shape. In CO2, however, there are two double bonds and no lone electrons on the central atom, hence the molecule has a linear shape.
When there are two atoms bonded to the central atom and no lone pairs, the molecule adopts a linear shape. When lone pairs are present, bent geometry can be present.
CSe2 has Lewis structure like this: Se=C=Se (here are valence e- around the Se too, but no need to worry about these), Since it is considered that there are 2 bonds the shape would be linear. Linear corresponds to "sp" hybridization
Tetrahedral
That would be Trigonal Pyramidal in shape and have an sp3 hybridization.
IN an ammonia molecule the central nitrogen atom has 3 three bonds.
The molecular shape of IOF3 is a "seesaw". The central atom has 1 lone pair of electrons and at the same time has 4 bonds
This is a trigonal pyramidal molecule.
planar triangular
HCN is a compound called hydrogen cyanide. It is commonly known as just cyanide and became infamous as a poison. It is a carbon atom, a hydrogen atom and a nitrogen atom combined in what is called a linear molecular shape. The nitrogen has 3 bonds to the central carbon, and the hydrogen has a single bond to the carbon.
Carbon dioxide, CO2, is a linear molecule with double bonds between each oxygen atom and the central carbon atom, O=C=O.