Seungah_S_SeleniumModel

__Model of Selenium__
In a model of one selenium atom, there are 34 electrons, 45 neutrons, and 34 protons. The electrons orbit the nucleus in 4 energy levels like the picture below. There are 2 electrons in the first level, 8 in the second, then 18, and in the last level, there are 6 electrons. Its total mass is 79 AMU.



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