Question

Zirconium has an atomic number of 40. How many neutrons are there in an isotope of zirconium-92?

A. 40
B. 52
C. 92
D. 132

Answer 1

NOTE
atomic number =number of protons and electrons
however number of neutrons with protons gives mass number .
92-40 =52 (B)

Answer 2

Answer:

the answer is b

Explanation: