Answer:
B. an electron and a proton
Explanation:
An element is a pure substance that cannot be broken down into any other substances because it consists of only one type of atom. Each element consist of three types of sub-atomic particles known as protons, neutrons, and electrons. Protons having a positive charge, neutrons a neutral charge, and electrons a negative charge. Both protons and neutrons are both the same size, but have opposite charges. Protons and electrons attract each other because opposite charges have a attraction to each other.
Therefore, Option 2: An electron and a proton, is correct.
