Understanding Chromium Compounds and Ions

This video tutorial explains how to write the formula for Chromium(II) Oxide. It begins by identifying the element symbols for Chromium (Cr) and Oxygen (O). The video then discusses the significance of the Roman numeral in indicating the charge of transition metals, specifically the 2+ charge for Chromium. It further explains how to balance the charges between Chromium and Oxygen to form an ionic compound, resulting in a net charge of zero. The tutorial concludes with a recap of the formula for Chromium(II) Oxide.

What is the symbol for chromium in the periodic table?

• Cr

• Co

• Cm

• Ch

What does the Roman numeral in Chromium 2 Oxide indicate?

• The charge of chromium

• The number of oxygen atoms

• The number of electrons in chromium

• The atomic number of chromium

What is the charge on the oxygen ion in Chromium 2 Oxide?

• 1+

• 2+

• 1-

• 2-

Why is it necessary to balance the charges in an ionic compound?

• To decrease the compound's melting point

• To make the compound more stable

• To ensure the compound is neutral

• To increase the compound's reactivity

What is the final formula for Chromium 2 Oxide?

• Cr2O

• CrO2

• CrO

• Cr2O3