The atomic number of Re is 75. The atomic mass of one of its isotopes is 186. How many neutrons are in an atom of this isotope? A. 75 B.111 C. 186 D. 261

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asked Jan 24, 2021 45.2k views

2 Answers

Chris Van Opstal · Answer 1 · 2021-01-30T02:08:55+0000

Answer:

B.111

Step-by-step explanation:

Atomic mass = number of protons(or atomic number) + number of neutrons

186 = 75 + number of neutrons

number of neutrons = 186 -75 = 111