Compare the number of valence electrons an oxygen, O, atom has with the number of valence electrons a selenium, Se, atom has. Are oxygen and selenium in the same period or group?
Go to this site and click on O and Se. Scroll down the right side to look for the electronic configuration. You will see both are in the same group and both have similar outer shell electrons.
Compare the number of valence electrons in an atom of oxygen, O, with the number of valence electrons in an atom of selenium, Se. Are oxygen and selenium in the same period or group?
To compare the number of valence electrons an oxygen atom has with the number of valence electrons a selenium atom has, you need to first determine their electron configurations.
1. Oxygen (O) has an atomic number of 8, which means it has 8 protons.
- The electron configuration of oxygen is 1s² 2s² 2p⁴.
- The valence shell of oxygen is the second shell (2s² 2p⁴), with a total of 6 valence electrons.
2. Selenium (Se) has an atomic number of 34, so it has 34 protons.
- The electron configuration of selenium is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁴.
- The valence shell of selenium is the fifth shell (5s² 4d¹⁰ 5p⁴), with a total of 6 valence electrons.
Therefore, both oxygen and selenium have the same number of valence electrons, which is 6.
Now, let's determine whether oxygen and selenium are in the same period or group.
- Period refers to the horizontal rows on the periodic table, indicating the number of occupied electron shells.
- Group refers to the vertical columns on the periodic table, indicating the number of valence electrons and similar chemical properties.
Oxygen (O) is in Period 2 (2nd row) and Group 16 (also known as Group VIA or Group 6).
Selenium (Se) is in Period 4 (4th row) and Group 16 (also known as Group VIA or Group 6).
Therefore, both oxygen and selenium are in the same period (Period 2 and Period 4) and the same group (Group 16), also known as Group VIA or Group 6.