1.40 Suggest explanations for the following. b. The enthalpy changes associated with the attachment of the first and second electrons to an O atom are exothermic and endothermic, respectively. c. In a Li atom In its ground state, the outer electron occupies a 2s rather than a 2p orbital.

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Q: 5. How many orbitals are in the n=3 electron shell of an atom?

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