Ionic Charges and Chemical Formulas

The video tutorial explains how to write the formula for barium iodide. It begins by identifying the element symbols for barium (Ba) and iodine (I). The tutorial then discusses the ionic charges of these elements, with barium having a 2+ charge and iodine a 1- charge. To balance the charges, two iodine atoms are needed for each barium atom, resulting in the formula BaI2. The crisscross method is also demonstrated as an alternative way to derive the formula. The video concludes with a summary of the process.

What is the symbol for barium when writing the formula for barium iodide?

• Bi

• B

• Br

• Ba

Which group in the periodic table does barium belong to, and what is its ionic charge?

• Group 4, 4+

• Group 3, 3+

• Group 2, 2+

• Group 1, 1+

What is the ionic charge of the iodide ion?

• 2-

• 1-

• 2+

• 1+

How many iodine atoms are needed to balance the charge of one barium ion?

• One

• Two

• Four

• Three

What method can be used to balance the charges when writing the formula for barium iodide?

• Division method

• Addition method

• Crisscross method

• Subtraction method

What is the final chemical formula for barium iodide?

• Ba2I2

• BaI

• BaI2

• Ba2I