noun ダウンロード 🔗共有 中性子 A subatomic particle forming part of the nucleus of an atom and having no charge; it is a combination of an up quark and two down quarks. Examples : "The atom's nucleus contains protons and neutrons. " 原子核には陽子と中性子が含まれています。 physics element chemistry AIとチャット語彙ゲーム読解練習