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In Homework question 2.45, it asks to write the hybridization of each lone pair in the bonding in H2C =(double bond) CHCHO. The drawing in the answer key says the lone pairs of O have a hybridization of sp2 but the hybridization of O when its bonded is 2sp2 (difference is the 2 in front). What does this 2 represent? I'm very confused how to determine if i need to put that 2/# or not.
2 stands for the energy level in which the hybridized orbitals are located. I think they're only necessary when writing bond hybridization. The number is associated with the element's period in the periodic table.
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