1. Atomic Number: Selenium (Se) has an atomic number of 34. This means a neutral selenium atom has 34 protons.
2. Number of Electrons: In a neutral atom, the number of protons and electrons is equal. Therefore, selenium has 34 electrons.
3. Atomic Mass: The atomic mass of selenium is approximately 79.
4. Number of Neutrons: To find the number of neutrons, subtract the atomic number (number of protons) from the atomic mass:
79 (atomic mass) - 34 (atomic number) = 45 neutrons
Therefore, selenium has 45 neutrons and 34 electrons.
