Answer:
Selenium has 34 protons and 45 neutrons in its nucleus giving it an atomic number of 34 and a atomic mass of 79. Selenium is in Period 4 of the Periodic Table because it has 4 electron shells
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Answer:
Selenium has 34 protons and 45 neutrons in its nucleus giving it an atomic number of 34 and a atomic mass of 79. Selenium is in Period 4 of the Periodic Table because it has 4 electron shells