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.
According to J.J. Thomson's model of an atom, it consists of a positively charged sphere with neutrons embedded in it. However, it was later found that the positively c â¦ harged particles reside at the center of the atomcalled the nucleus, and the electrons revolve around the nucleus.