Rubidium and Ionic Compounds

The video tutorial explains how to write the formula for rubidium phosphide. It begins by identifying the element symbols for rubidium (Rb) and phosphorus (P), and discusses their respective charges. Rubidium, being in group 1, has a +1 charge, while phosphorus, in group 15, has a -3 charge. The tutorial explains that rubidium phosphide is an ionic compound and demonstrates how to balance the charges to achieve a net charge of zero, resulting in the formula Rb3P.

What is the chemical symbol for rubidium?

• Rb

• Ru

• Rd

• Re

Which group on the periodic table does rubidium belong to?

• Group 1

• Group 2

• Group 15

• Group 18

What is the ionic charge of phosphorus in rubidium phosphide?

• 4+

• 3-

• 2-

• 1+

Why is rubidium phosphide considered an ionic compound?

• It is formed by two non-metals.

• It is formed by a metal and a non-metal.

• It is formed by two metals.

• It is formed by noble gases.

How many rubidium ions are needed to balance the charge of one phosphide ion?

• Four

• Three

• Two

• One

What is the chemical formula for rubidium phosphide?

• Rb4P

• Rb3P

• Rb2P

• RbP