Steric number ka simple formula hai: sigma bonds + lone pairs. Molecular orbitals ki zaroorat nahi, bas structure samjho. Chemistry padhte waqt main hamesha yehi trick use karti hoon, kyunki pharmacy mein humko jaldi jaldi drug structures analyze karne hote hain. Actually, aam papad business mein bhi aise shortcuts seekhne padte hain — jaise aam ki quality check karne ka tareeka — theory se zyada practical rehta hai kaam.
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