Test: MCAT Physical

1.

The isotope  has _________ protons, _________ neutrons, and _________ electrons.

78 . . . 78 . . . 53

53 . . . 78 . . . 53

131 . . . 53 . . . 131

53 . . . 78 . . . 78

53 . . . 131 . . . 53

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