Question

An isotope of iodine has a mass of 134 amu. How many neutrons does the

isotope contain?
A. 67
B.153
C. 81
D. 74

Answer 1

The correct option is C: the isotope of iodine contains 81 neutrons.

Explanation:

The mass (A) of the iodine isotope is given by:

`A = Z + N`

Where:

Z: is the number of protons

N: is the number of neutrons

For iodine Z= 53, so if A = 134 the number of neutrons is:

`N = A - Z = 134 - 53 = 81`

Therefore, the correct option is C. The isotope of iodine contains 81 neutrons.

I hope it helps you!