Ionic Compounds and Their Properties

The video tutorial explains how to derive the chemical formula for calcium bromide. It begins by identifying calcium as a cation due to its position in Group 2 of the periodic table, which tends to lose two electrons. Bromine, a halide, gains an electron to form a bromide anion. The tutorial demonstrates that two bromide ions are needed to balance the charge of one calcium ion, resulting in the formula CaBr2.

What is the first step in writing the chemical formula for an ionic compound?

• Identify the positive ion first

• Identify the negative ion first

• Write the formula for the cation

• Write the formula for the anion

Which group in the periodic table does calcium belong to?

• Group 4

• Group 3

• Group 2

• Group 1

How many electrons does calcium tend to lose when it ionizes?

• Four

• Three

• Two

• One

What type of ion does bromine form?

• Cation

• Anion

• Neutral atom

• Radical

How many electrons does bromine gain to achieve a stable electron configuration?

• Four

• Three

• Two

• One

What is the charge of a calcium ion?

• 2-

• 1-

• 2+

• 1+

What is the charge of a bromide ion?

• 1+

• 2+

• 1-

• 2-

How many bromide ions are needed to balance the charge of one calcium ion?

• Four

• One

• Two

• Three

What is the chemical formula for calcium bromide?

• Ca2Br

• Ca2Br2

• CaBr

• CaBr2

Why do calcium and bromine ions combine in a 1:2 ratio?

• To achieve a net positive charge

• To achieve a net negative charge

• To achieve a stable compound

• To achieve a neutral compound