Look at Selenium (Se) and Oxygen (O) on the Periodic Table which one is larger? (1 point) Responses Oxygen (O) Oxygen (O) Selenium (Se) Selenium (Se) They are both the same size

Answer 1

Selenium (Se) is larger than Oxygen (O). In the periodic table, atomic size generally increases as you move down a group (column) due to the addition of electron shells. Since Selenium is in period 4 and Oxygen is in period 2, Selenium has more electron shells, making it larger in size. Therefore, the correct answer is Selenium (Se).