Valence Electrons in Selenium

The video tutorial explains two main methods to find the number of valence electrons for selenium (Se). The first method involves using the periodic table, where selenium is located in group 16, indicating it has six valence electrons. The second method uses the electron configuration of selenium, identifying the highest energy level electrons, which also totals six valence electrons. The video also demonstrates how to write the Lewis structure for selenium, placing six valence electrons around the element symbol. Dr. B concludes by summarizing the methods discussed.

What is the first method mentioned for finding the number of valence electrons in selenium?

• Observing the physical properties

• Looking at the periodic table

• Using the atomic number

• Counting the protons

Which group in the periodic table contains elements with one valence electron?

• Group 2

• Group 13

• Group 1

• Group 16

In which group is selenium located on the periodic table?

• Group 16

• Group 12

• Group 14

• Group 18

How many valence electrons does selenium have according to its group number?

• Seven

• Five

• Six

• Four

What is the highest energy level in selenium's electron configuration?

• 4s2

• 3s2

• 5p4

• 2p6

How many valence electrons are present in the 4s and 4p orbitals of selenium?

• Six

• Four

• Two

• Eight

What is the total number of valence electrons in selenium as determined by its electron configuration?

• Eight

• Five

• Seven

• Six