The video tutorial explains how to write the formula for chromium-6 phosphate. It begins by identifying the element symbols for chromium and phosphate. The phosphate ion is described as a polyatomic ion with a charge of three minus. The tutorial then explains how to balance the charges between chromium, which has a charge of six plus, and the phosphate ions to achieve a net charge of zero. The final formula for chromium-6 phosphate is presented as Cr(PO4)2. The video concludes with a brief summary and thanks to the viewers.

What is the element symbol for chromium?

• Cr

• Ch

• Co

• Cm

Which of the following is a polyatomic ion?

• Sulfide

• Chloride

• Phosphate

• Oxide

What is the ionic charge of the phosphate ion?

• 4-

• 1-

• 3-

• 2-

How many phosphate ions are needed to balance the charge of chromium in chromium-6 phosphate?

• One

• Two

• Three

• Four

What is the purpose of using parentheses in the formula for chromium-6 phosphate?

• To show the number of atoms

• To separate different elements

• To balance the charges

• To indicate a polyatomic ion

What is the final formula for chromium-6 phosphate?

• CrPO42

• Cr2(PO4)3

• Cr(PO4)2

• CrPO4