Oxidation Numbers in PF5

The video tutorial explains how to determine the oxidation numbers for each element in phosphorus pentafluoride (PF5). It begins by stating that PF5 is a neutral compound, meaning the sum of oxidation numbers must equal zero. Fluorine, with an oxidation number of -1, is used as a reference. Since there are five fluorine atoms, their total oxidation number is -5. To balance this, phosphorus must have an oxidation number of +5. The tutorial concludes by verifying the calculations and confirming the oxidation numbers for PF5.

What is the total sum of oxidation numbers in a neutral compound like PF5?

• It is always positive.

• It is always negative.

• It is zero.

• It varies depending on the elements.

What is the oxidation number of fluorine in PF5?

• +5

• 0

• +1

• -1

How many fluorine atoms are present in PF5?

• 3

• 4

• 5

• 6

What must be the oxidation number of phosphorus in PF5 to balance the compound?

• +5

• +4

• +6

• +3

What is the purpose of verifying the oxidation numbers in PF5?

• To confirm the sum equals zero.

• To determine the molecular weight.

• To ensure the compound is stable.

• To check for any errors in the chemical formula.