Final answer:
Boron, which has an atomic number of 5, has a net charge of zero when neutral and an average atomic mass of 10.8 amu. Its mass can vary slightly due to the presence of isotopes boron-10 and boron-11.
Step-by-step explanation:
The atomic charge of boron is determined by its number of protons and electrons. In its neutral state, boron has an atomic number of 5, which means it has 5 protons and, when neutral, 5 electrons. This results in a net charge of zero. However, boron can form ions by losing electrons, and in such cases, it can have a positive charge. The atomic mass of boron, which is distinct from its atomic charge, is 10.8 amu, which is the average mass of its naturally occurring isotopes: about 20% boron-10 and 80% boron-11. This information is important for understanding the nuclear composition of boron.