Look at the diagram showing the Bohr model of the atom below. Particle 4 has a charge of +1. Name this particle.

In the Bohr model of the atom, Particle 4, which has a charge of +1, represents the proton. Protons are subatomic particles found in the nucleus of an atom and carry a positive electrical charge. They significantly contribute to the atomic number, which defines the identity of the element. For instance, an atom with one proton is hydrogen, with two protons is helium, and so forth. The presence of protons in the nucleus, along with neutrons (which have no charge), balances the negative charge of electrons that orbit the nucleus. This model helps visualize how electrons occupy distinct energy levels or shells around the nucleus, thus providing a foundational understanding of atomic structure in chemistry.