Ionic Compounds and Their Properties

The video tutorial explains how to write the formula for strontium iodide. It begins by identifying strontium as a metal and iodine as a non-metal, forming an ionic compound. The video discusses the ionic charges of strontium (2+) and iodine (1-) using the periodic table. It then demonstrates how to write the formula by balancing these charges to achieve a neutral compound, resulting in the formula SrI2. The tutorial concludes with a summary of the steps and the final formula.

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

• Covalent compound

• Molecular compound

• Ionic compound

• Metallic compound

Which group in the periodic table does strontium belong to?

• Group 1

• Group 18

• Group 17

• Group 2

What is the ionic charge of iodine when it forms an ion?

• 2-

• 2+

• 1+

• 1-

What is the charge on a strontium ion?

• 2-

• 1-

• 2+

• 1+

How many iodine ions are needed to balance the charge of one strontium ion?

• One

• Two

• Four

• Three

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

• To increase the compound's reactivity

• To ensure the compound is neutral

• To decrease the compound's solubility

• To make the compound stable

What is the significance of not seeing the word 'ion' after the compound name?

• It suggests the compound is metallic

• It means the compound is neutral

• It indicates the compound is ionic

• It shows the compound is covalent

What is the correct formula for strontium iodide?

• Sr2I2

• Sr2I

• SrI2

• SrI