Chromium and Polyatomic Ions

The video tutorial explains how to name the compound CRPO4. It begins by identifying the components: the phosphate ion (PO4) and chromium, a transition metal. The tutorial outlines the steps to name the compound, starting with the name of chromium from the periodic table, followed by the phosphate ion. It highlights the importance of determining the charge of chromium, as it is a transition metal with variable charges. By analyzing the phosphate ion's charge, the tutorial concludes that chromium must have a 3+ charge, leading to the final name: Chromium(III) Phosphate.

What is the polyatomic ion present in CrPO4?

• Carbonate

• Nitrate

• Phosphate

• Sulfate

Which type of metal is chromium classified as?

• Alkaline earth metal

• Transition metal

• Alkali metal

• Noble gas

What is the first step in naming CrPO4?

• Determine the net charge of the compound

• Identify the charge of chromium

• Write the name of the polyatomic ion

• Write the name of chromium as it appears on the periodic table

What is the charge of the phosphate ion in CrPO4?

• 4-

• 1-

• 3-

• 2-

Why do transition metals like chromium require Roman numerals in their names?

• They have a fixed charge

• They can have multiple ionic charges

• They are nonmetals

• They are always positively charged

What charge must chromium have in CrPO4 to balance the compound?

• 1+

• 2+

• 3+

• 4+

What is the correct name for CrPO4?

• Chromium Phosphate

• Chromium(II) Phosphate

• Chromium(III) Phosphate

• Chromium(IV) Phosphate

What does the Roman numeral in Chromium(III) Phosphate indicate?

• The number of phosphate ions

• The atomic number of chromium

• The charge of the chromium ion

• The number of atoms in the compound