Question

energy release quick check
the element radium has a mass number of 226 and an atomic number of 88. how many neutrons does an atom of radium have? (1 point)
314
88
138
226

Explanation:

Step1: Recall the relationship formula

The mass number ($A$) is the sum of protons and neutrons, and the atomic number ($Z$) is the number of protons. So the number of neutrons $N=A - Z$.

Step2: Substitute the given values

Given that $A = 226$ and $Z=88$, then $N=226 - 88$.

Step3: Calculate the result

$226-88 = 138$.

Answer:

138