Most stable radio-isotope among the following –: (A) O –18, (B) C – 14, (C) P – 32, (D) I – 125
Answer is A. O-16,O-17, O -18 are stable radioisotopes of oxygen.
C-12, C-13, are stable radioisotopes of carbon (not C-14).
P-31, is stable radioisotopes of phosphorus (not P-32).
1-125 is radioactive form of iodine (not stable).