The fixed number is the amount of protons and neutrons. Due to the fact that we have selenium-79, that way the sum of protons and neutrons add up to 79.

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The atomic number of selenium is 34. Since atomic number represents number of protons, that will be 34.

Take the difference of the mass number and also the atomic number to acquire the variety of neutrons. So, 79-34 will acquire you 45 neutrons.

The variety of electrons relies on even if it is the atom has a charge. If over there is no fee provided, that way the atom is in its floor state, or many stable state. The variety of electrons would certainly be same to the variety of protons. Therefore, the number of electrons the selenium is 34.

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