Valence Electrons in Barium

The video tutorial explains two main methods to determine the number of valence electrons for barium. The first method involves using the periodic table, where barium is located in group two, indicating it has two valence electrons. The second method uses the electron configuration, identifying the highest energy level as 6s2, confirming the presence of two valence electrons. The tutorial also demonstrates how to draw the Lewis structure for barium, showing the placement of these electrons.

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

• Using the atomic number

• Looking at the periodic table

• Calculating the atomic mass

• Observing the physical properties

Which group on the periodic table does barium belong to?

• Group 18

• Group 2

• Group 13

• Group 1

How many valence electrons do elements in Group 2 of the periodic table have?

• Four

• Three

• Two

• One

What is the highest energy level in the electron configuration of barium?

• 3p

• 4d

• 6s

• 5s

How many valence electrons does barium have according to its electron configuration?

• One

• Two

• Three

• Four

In the Lewis structure for barium, how are the valence electrons represented?

• As dots around the symbol

• As lines connecting atoms

• As numbers above the symbol

• As letters next to the symbol

What is one way teachers might suggest representing valence electrons in a Lewis structure?

• By writing them as fractions

• By splitting them up

• By using different colors

• By drawing circles