The slogan of chemical elements in senior three is deuterium and tritium.

1, different neutron numbers (0, tritium 1, deuterium 2),

2. The mass numbers are also different (1, tritium 2, deuterium 3).

3. Different physical characteristics (radioactivity)

Pie, tritium dao and deuterium cuan are three isotopes of hydrogen, with the same number of protons but the same chemical properties (the same number of electrons in the outermost layer).

The relative abundance of hydrogen-1 is 99.98%, and that of hydrogen -2 is 0.0 16%. These two kinds of hydrogen are stable isotopes in nature. The isotope hydrogen -3(3H, tritium, also known as overweight hydrogen) with mass number 3 is also found in nuclear reaction, and its content in nature is extremely small, only 0.004%. Hydrogen -2(2H, deuterium, also known as heavy hydrogen) and hydrogen -3(3H, tritium, also known as overweight hydrogen) are also raw materials for making hydrogen bombs.

Extended data

Application of isotopes:

1 agriculture:

In agriculture, excellent crop varieties have been cultivated by radiation or the combination of radiation and other methods, which greatly increased the output of crops such as grain, cotton and soybean. Using isotope tracer technology to study the rational use of pesticides and fertilizers and soil improvement provides a new means for increasing agricultural production. Other research work, such as radiation preservation of food, has also made great progress.

2, medical aspects:

In medicine, there are thousands of medical units in China, and more than 100 isotope therapies have been established clinically, including external irradiation therapy and internal medicine irradiation therapy. Isotopes also play an important role in immunology, molecular biology, genetic engineering research and the development of basic nuclear medicine.

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