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matter that cannot be broken down into simpler matter. chemical elements are cornerstones of materials. elements consist of atoms that consist of a nucleus of positive protons, neutral neutrons, and a shell of electrons.
それ以上単純な物質に分かつことができない物質。化学元素は物質の基礎。元素は原子から成り、原子は正電荷の陽子と中性子、電子殻から成る。