Boron is one position to the left of carbon on the periodic table. The atomic number of carbon is 6. Given its position on the periodic table what is the atomic number of boron?
The atomic number of an element represents the number of protons in its nucleus. Carbon, with an atomic number of 6, has 6 protons. Boron is one position to the left of carbon on the periodic table, so the atomic number of boron is 5. Therefore, the correct answer is 5.
