最空的和最重的原子是由原子核和在核的周围环绕着的电子构成的:各种元素的原子核含有一定数量的微粒。在所有各种原子中,最简单的是氢原子。在氢原子中只有一个电子,同时原子核里面只有一个微粒。这个微粒便是质子。在氢原子的中心是原子核,围绕着原子核旋转的是电子。一个氢原子的直径大约是0.000,000,01厘米。这就是说:一亿个氢原子排 The most empty and heaviest atoms are made up of nuclei and electrons that surround the nuclei: The nuclei of various elements contain a certain number of particles. Of all the various atoms, the simplest is a hydrogen atom. There is only one electron in the hydrogen atom, and there is only one particle in the nucleus. This particle is a proton. At the center of the hydrogen atom is the nucleus, and electrons rotate around the nucleus. The diameter of a hydrogen atom is about 0.000,000,01 cm. This means: 100 million hydrogen atoms