DANB Radiation Health and Safety (RHS) Practice Exam

What is the definition of an electron?

1. A positively charged particle

2. An electrically neutral tiny particle

3. A negatively charged atomic particle

4. The nucleus of an atom

The correct answer is: A negatively charged atomic particle

The definition of an electron is that it is a negatively charged atomic particle. Electrons are fundamental components of atoms, and they orbit the nucleus, which is composed of protons and neutrons. Their negative charge is paired with the positive charge of protons, allowing for the balance of electric charge within an atom. This property is essential in chemical bonding and the formation of molecules, as electrons are involved in interactions with other atoms. Understanding the role of electrons is crucial for grasping concepts in chemistry and physics, as they influence an atom's behavior during reactions and determine its electrical properties.