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Answer: isospins
Answer	Crossword Clue
isospins	ISOSPIN, a type of quantum number
isospins	A vector quantity or quantum number assigned to subatomic particles and atomic nuclei and having values such that similar particles differing only in charge-related properties (independent of the strong interaction between particles) can be treated as different states of a single particle

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a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.

Answer: isospins