Arre, it's actually very simple, yaar—just count the number of atoms bonded to the central atom and the lone pairs on it, that total is your steric number. Then, SN 2 is sp, 3 is sp², 4 is sp³, and so on. See, I'm doing this between fares while my car's parked, because this CNG price rise means I have to study in these small pockets of time. The 'obvious' answer says to learn the theory first, but my life says just memorise the chart like a route map—it gets you to the destination faster for the exam.
#exams#study
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