Answer
\begin{matrix}
atom & nº \space protons & nº \space neutrons \\
\hline
boron-10 & 5 & 5 \\
zinc-72 & 30 & 42 \\
iron-59 & 26 & 33 \\
gold-198 & 79 & 119
\end{matrix}
Work Step by Step
1. Find the atomic number for each element using a periodic table.
a. 5
b. 30
c. 26
d. 79
- This number represents the number of protons.
2. The atomic mass of each element is represented by the number right after its name.
number of protons + number of neutrons = atomic mass
number of neutrons = atomic mass - number of protons.
Calculate the number of neutrons in each:
a. 10 - 5 = 5
b. 72 - 30 = 42
c. 59 - 26 = 33
d. 198 - 79 = 119
