Valence Electrons and Molecular Compounds

The video explores whether PF5 is ionic or covalent. PF5, or phosphorus pentafluoride, is identified as a covalent compound because both phosphorus and fluorine are non-metals. The video explains the structure of PF5, highlighting the shared electrons in covalent bonds. Each fluorine atom achieves an octet, while phosphorus has an expanded octet with 10 valence electrons. The video concludes by reaffirming PF5 as a covalent compound.

What type of elements are phosphorus and fluorine?

• Non-metals

• Noble gases

• Metalloids

• Metals

What type of compound is PF5?

• Covalent

• Amphoteric

• Ionic

• Metallic

What does a line between two atoms in a molecular structure represent?

• A pair of unshared electrons

• A pair of shared electrons

• A single atom

• A metallic bond

How many valence electrons does each fluorine atom have in PF5?

• 10

• 8

• 6

• 7

What is unique about phosphorus in PF5 regarding its electron configuration?

• It has a standard octet

• It does not share electrons

• It has an expanded octet

• It has fewer than 8 electrons

What is the total number of valence electrons shared by phosphorus in PF5?

• 12

• 14

• 8

• 10

Why is PF5 considered a molecular compound?

• It forms ionic bonds

• It consists of non-metal atoms sharing electrons

• It has a crystalline structure

• It contains metal atoms