(A) Must be very reactive chemically.
(B) Has an atomic number that is one more than that of X
(C) Has a mass number that is one less than that of X
(D) Must be radioactive
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(A) Must be very reactive chemically.
(B) Has an atomic number that is one more than that of X
(C) Has a mass number that is one less than that of X
(D) Must be radioactive