Chromium Iodide and Ionic Charges

The video tutorial explains how to write the chemical formula for chromium 3 iodide. It begins by identifying the symbols for chromium and iodine, noting their respective charges. The tutorial then demonstrates how to balance these charges to achieve a neutral compound, resulting in the formula CrI3. The video concludes with a summary of the process.

What is the element symbol for chromium?

• Ch

• Co

• Cm

• Cr

What is the ionic charge of iodine when it forms iodide?

• 1+

• 3+

• 2-

• 1-

Why does chromium 3 iodide have a neutral charge?

• Because it has equal numbers of protons and electrons

• Because the charges of chromium and iodide ions balance each other

• Because it is a covalent compound

• Because it contains no ions

How many iodide ions are needed to balance the charge of one chromium ion in chromium 3 iodide?

• 4

• 3

• 2

• 1

What is the correct chemical formula for chromium 3 iodide?

• CrI

• Cr3I

• CrI3

• CrI2