难解的疑团原子好比万花筒,里面变化多端,其中一种变化叫做β衰变,意思是从某些放射性元素的原子核自动地抛射出β(貝搭)粒子后,轉变为別的元素的原子核。这种β粒子也就是电子或正电子(带正电荷的电子)。原子核里主要是质子和中子,沒有电子和正电子,那么β粒子是怎么出来的呢?原来,中子可以轉化为带正电荷的质子,并放出电子。质子可以轉化为不带电荷的中子,并放出正电子。这种自动轉化就叫衰变,衰变式子写出如下:中子→质子+电子 The puzzling atom is like a kaleidoscope, with many variations. One of the changes is called beta decay, which means that after the beta particles are automatically ejected from the nucleus of certain radioactive elements, they transform into the nucleus of other elements. The beta particles are also electrons or positrons (positively charged electrons). There are mainly protons and neutrons in the atomic nucleus. There are no electrons and positrons. So how do beta particles come out? In the beginning, neutrons can be transformed into positively charged protons and emit electrons. Protons can be transformed into uncharged neutrons and emit positrons. This automatic conversion is called decay. The decay formula is written as follows: Neutron → Proton + Electron