【书写经典】第124期，陆游《冬夜读书示子聿》 搜

In the nucleus of each atom of uranium 235 (u 235) are 92 protons and 143 neutrons, for a total of 235. the arrangement of particles within uranium 235 is somewhat unstable and the nucleus can disintegrate if it is excited by an outside source. when a u 235 nucleus absorbs an extra neutron, it quickly breaks into two parts. this process is known as fission (see diagram below). each time a u.

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