[At least] Three. There could be more if string theory or the theory of branes proves to be true.
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It has to do with how the atoms are connected. A full explanation of the details would be quite long, but basically the atoms in diamond are connected strongly in three dimensions but the atoms in graphite are connected strongly in only two dimensions.
one dimensions
2 dimensions
it has 2 Dimensions
It has three dimensions.
Space has 3 million dimensions
They have positive non-integer dimensions.
It has 2 dimensions which are length and width
There are 20 atoms and there are 6 Carbon atoms, 8 Hydrogen atoms, 6 Oxygen atoms.
how many atoms are there in magnesiumoxide 2 atoms are in magnesium 2 atoms are in magnesium
Other Dimensions has 329 pages.