Kaplan Nursing Entrance Practice Exam

Which of the following particles has a positive charge?

1. Neutron

2. Electron

3. Proton

4. Quark

The correct answer is: Proton

The particle that has a positive charge is the proton. Protons are subatomic particles found in the nucleus of an atom and are one of the primary constituents of matter. Each proton carries a charge of +1 elementary charge, which is essential for the structure of atoms, as they determine the atomic number and, consequently, the element's identity. Furthermore, protons play a crucial role in the electrostatic forces that hold the nucleus together in balance with neutrons, which are neutral and do not possess any charge. This positive charge of protons also interacts with the negatively charged electrons, which orbit the nucleus, helping to keep the atom stable. Understanding the role of protons is fundamental in nuclear physics, chemistry, and biology, as they influence both the chemical properties of elements and the basic structure of matter.