Find the Number of Protons Ac

To find the number of protons in ${\displaystyle \text{actinium}}$, first locate the element on the periodic table. Next, find the atomic number which is located above the element\'s symbol. Since ${\displaystyle \text{actinium}}$\'s atomic number is ${\displaystyle 89}$, ${\displaystyle \mathrm{Ac}}$ has ${\displaystyle 89}$ protons.