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Selenium has four electron shells.
34
Selenium
Atomic number= No. of electrons in the atom. Atomic no. of selenium=34. Therefore,selenium has 34 electrons in each of its atom.
6
45 neutrons
Phosphorous
78
Selenium (Se) has an atomic number of 34 which means in a balance atom Se will have 34 protons and 34 electrons then Se has a mass of 79 so to get the neutrons we minus the protons from the mass and we get 45 final answer: Neutrons: 45 Protons:34 Electrons: 34
Selenium needs two more electrons.
One atom of Se and one atom of O.
1 atom of Selenium and 4 of Oxygen