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一、什么叫做同位素二、同位素应用干植物营养研究中的意义三、应用同位素方法研究植物营养的一些成就四、应用同位素时应有的一些认识一、什么叫做同位素自然界所有物質都是由原子和分子组成的,原子是由原子核和环绕着原子核周围的电子组成,原子核是由带正电的質子和不带电的中子构成的,在原子核里質子和中子的总数就等于原子的質量数,各种不同的原子就形成了自然界中种元素。但是有的元素的原子質量完全相同,它们具有同等的电荷和相同的質
First, what is called isotope Second, the application of isotopes in the meaning of dry plant nutrition Third, the application of isotope method to study some of the achievements of plant nutrition Fourth, the application of isotopes should have some understanding First, what is called isotopes All substances in nature by atoms and The atoms, which are made up of nuclei and electrons surrounding the nuclei, are made up of positively charged protons and uncharged neutrons. The total number of protons and neutrons in the nucleus is equal to the mass of the atom, A variety of different atoms formed the kind of elements in nature. But some elements have exactly the same atomic mass, they have the same charge and the same mass