Rubidium and Its Compounds

This video tutorial explains how to write the formula for rubidium sulfide. It begins by identifying the element symbols for rubidium (Rb) and sulfur (S), and discusses the ionic nature of the compound due to the difference in electronegativity. The tutorial explains the charges of rubidium and sulfur based on their positions in the periodic table, and demonstrates how to balance these charges to achieve a neutral compound. The final formula for rubidium sulfide is derived as Rb2S. The video concludes with a brief closing statement.

What is the element symbol for rubidium?

• Re

• Rd

• Ru

• Rb

Which group in the periodic table does rubidium belong to?

• Group 1

• Group 16

• Group 17

• Group 2

What is the ionic charge of sulfur in rubidium sulfide?

• 2-

• 0

• 1+

• 3-

How many rubidium atoms are needed to balance the charge of one sulfur atom in rubidium sulfide?

• Four

• One

• Two

• Three

What is the net charge of rubidium sulfide?

• 0

• 2+

• 2-

• 1+

What is the correct formula for rubidium sulfide?

• Rb2S3

• RbS2

• Rb2S

• RbS