Valence Electrons and Radium's Configuration

The video tutorial explains two methods to determine the number of valence electrons for radium. The first method involves using the periodic table, where radium is in group two, indicating it has two valence electrons. The second method uses the electron configuration, identifying the highest energy level, 7s2, which also shows two valence electrons. The tutorial concludes with a demonstration of drawing the Lewis structure for radium, placing two electrons next to the element symbol.

What is one method to determine the number of valence electrons in radium?

• Observing the physical state

• Using the periodic table

• Counting the total number of electrons

• Measuring the atomic mass

Which group in the periodic table contains elements with two valence electrons?

• Group 18

• Group 1

• Group 2

• Group 13

How many valence electrons do elements in Group 13 typically have?

• 1

• 2

• 3

• 4

What is the atomic number of radium?

• 88

• 87

• 86

• 89

In the electron configuration of radium, which energy level is the highest?

• 7th

• 8th

• 6th

• 5th

How many valence electrons are present in the 7s orbital of radium?

• 4

• 1

• 2

• 3

When drawing the Lewis structure for radium, how are the valence electrons represented?

• As dots around the element symbol

• As arrows pointing to the element

• As lines connecting to other elements

• As numbers above the element symbol

What is the significance of the 7s2 orbital in radium's electron configuration?

• It determines the element's color

• It represents the atomic mass

• It shows the total number of electrons

• It indicates the presence of two valence electrons