Ionic Compounds and Potassium

The video tutorial explains how to write the chemical formula for potassium iodide (KI). It begins by identifying potassium and iodine on the periodic table, noting that potassium is a metal and iodine is a non-metal, forming an ionic compound. The tutorial discusses the importance of ionic charges, with potassium having a +1 charge and iodine a -1 charge. These charges must balance to zero for the compound to be stable. The video concludes by confirming that KI is the correct formula for potassium iodide.

Which element is represented by the symbol 'K' in the periodic table?

• Kobalt

• Potassium

• Kadmium

• Krypton

What type of compound is formed when a metal and a non-metal combine?

• Metallic compound

• Molecular compound

• Ionic compound

• Covalent compound

What is the charge of potassium in an ionic compound?

• 2+

• 0

• 1-

• 1+

Why must the charges in an ionic compound add up to zero?

• To give the compound a color

• To allow the compound to dissolve in water

• To make the compound visible

• To ensure the compound is stable

What is the correct chemical formula for potassium iodide?

• K2I

• KI

• KI2

• KIO