noun ダウンロード 🔗共有 ナトリウム The chemical element (symbol Na) with an atomic number of 11 and atomic weight of 22.98977. It is a soft, waxy, silvery, reactive alkali metal that is never found unbound in nature. Examples : "The chef added a pinch of sodium to the soup to enhance its flavor. " シェフはスープの風味を増すために、ナトリウムをひとつまみ加えました。 element chemistry substance material science AIとチャット語彙ゲーム読解練習