##”sp”^3″d”##
In order to determine the of the central phosphorus atom in phosphorus pentafluoride, ##”PF”_5##, you must first draw the compound’s .
The molecule will have a total of ##40## , ##5## from the phosphorus atom, and ##7## from each of the five fluorine atoms.
The phosphorus atom will be the molecule’s central atom. It will form single bonds with the five fluorine atoms.
These will account for ##10## of the ##40## the molecule has. Each fluorine atom will have three lone pairs of electrons, which will account for the rest of the .
The molecule’s Lewis structure will look like this
Now you need to focus on the central atom, more specifically on how many regions of electron surround the central atom – this is known as the steric number
A region of electron density can be a covalent bond – single, double, and triple bonds all count as one region of electron density – or a lone pair of electrons.
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