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Answer for the clue "Oxygen atom's protons, e.g. ", 5 letters:
octad

Alternative clues for the word octad

Word definitions for octad in dictionaries

WordNet Word definitions in WordNet
n. the cardinal number that is the sum of seven and one [syn: eight , 8 , VIII , eighter , eighter from Decatur , ogdoad , octonary , octet ]

Usage examples of octad.

The interstellar drive had yet to be run continuously for years and whole octads on end.