How Many Neutrons Are In Selenium?
The chemical formula for selenium is Se. The atomic number of selenium is 34. The atomic mass of selenium is 78. The Number of neutrons is equal to the difference of atomic number and atomic mass. Number of neutrons = atomic mass – atomic number Number of neutrons = 78 – 34 Number of neutrons = 45 The isotopes of selenium 74Se has 40 neutrons, 76Se has 42 neutrons, 77Se has 43 neutrons and 80Se has 46 neutrons.
