Answer:
![5](https://img.qammunity.org/2023/formulas/mathematics/high-school/q35gspm3osqm4gl92d1u7bydqn7g6fougf.png)
Step-by-step explanation:
Here, we want to get the atomic number of boron
The atomic number of an element is simply the number of protons in the nucleus of the element
There are 5 protons in the nucleus of the element Boron. Thus, we can conclude that the atomic number of the element Boron is 5