Usage - Pronoun-Antecedent Agreement. A pronoun is a word used to stand for (or take the place of) a noun. A word can refer to an earlier noun or pronoun in the sentence. Example:
A subatomic particle is a unit of matter or energy that's the fundamental makeup of all matter. According to modern atomic theory, an atom has a nucleus, which is its center, or core. The nucleus contains subatomic particles: protons and neutrons. Protons are positively-charged particles. Neutrons are neutral particles.
Definition of proton. 1) A subatomic particle having a mass of 1.0073 amu and a charge of +1, found in thew nuclei of atoms. 2) A heavy subatomic particle with a positive charge; found in an atomic nucleus. Was this definition helpful?