化学是研究物质及其变化的科学,原子是构成物质的一种微粒,自然界中的许多物质是由原子直接构成的。如金刚石、硅、铝、铁、铜等。原子还是化学变化中的最小粒子。我们在八年级物理课上对原子已有接触,知道了原子核外的电子是分层排布的。其实,人们对原子的认识及对原子结构的探索经历了漫长的过程。 Chemistry is the science of the study of matter and its changes. Atoms are particles that make up matter. Many of the substances in nature are made up of atoms. Such as diamond, silicon, aluminum, iron, copper and so on. Atoms are also the smallest particles in chemical change. We have had contact with the atoms in the eighth grade physics class and we know that the electrons outside the nucleus are arranged hierarchically. In fact, people’s understanding of the atom and the exploration of the atomic structure have gone through a long process.