Final answer:
The correct mnemonic sentence to memorize the SEVEN diatomic elements is "Harry's Old Neighbor Opened His Icy Mint." Each word in this sentence corresponds to a diatomic element: Hydrogen, Oxygen, Nitrogen, Chlorine, Fluorine, Iodine, Bromine.
Step-by-step explanation:
The correct mnemonic sentence to memorize the SEVEN diatomic elements is C. "Harry's Old Neighbor Opened His Icy Mint." Each word in this sentence corresponds to a diatomic element: Hydrogen, Oxygen, Nitrogen, Clorine, Fluorine, Iodine, Bromine. By remembering this sentence, you can easily recall the diatomic elements.