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.
n. The positively charged ion of hydrogen, H + , formed by removal of the electron from atomic hydrogen and found in the form of hydronium ion in all aqueous solutions of acids.ydrogen ion-a positively charged atom of hydrogen; that is to say, a normal hydrogen atomic nucleus. cation-a positively charged ion. proton-a stable particle with positive charge equal to the negative charge of an electron. hydrogen atom-an atom of hydrogen.