Answer
\begin{matrix}
atom & nº \space protons & nº \space neutrons \\
\hline
sodium-25 & 11 & 14 \\
nickel-61 & 28 & 33 \\
rubidium-84 & 37 & 47 \\
silver-110 & 47 & 63
\end{matrix}
Work Step by Step
1. Find the atomic number for each element using a periodic table, it goes in the subscript on the left of the symbol.
a. sodium: Na = 11
b. nickel: Ni = 28
c. rubidium: Rb = 37
d. silver: Ag = 47
- 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. 25 - 11 = 14
b. 61 - 28 = 33
c. 84 - 37 = 47
d. 110 - 47 = 63
