Beryllium and Polyatomic Ions

The video tutorial explains how to write the chemical formula for beryllium hydroxide. It begins by identifying beryllium and hydroxide, noting that hydroxide is a polyatomic ion with the formula OH-. Beryllium, found in group 2 of the periodic table, forms ions with a 2+ charge. To balance the charges and form a neutral compound, two hydroxide ions are needed to counter the 2+ charge of beryllium. The final formula is Be(OH)2, with parentheses indicating two hydroxide ions. The tutorial concludes with a brief summary of the process.

What is the element symbol for beryllium?

• Bi

• Be

• B

• Br

Which of the following is a polyatomic ion that needs to be memorized?

• Sulfate

• Nitrate

• Chloride

• Hydroxide

In which group of the periodic table is beryllium found?

• Group 1

• Group 4

• Group 2

• Group 3

What charge does a beryllium ion typically have?

• 2-

• 1+

• 2+

• 1-

How many hydroxide ions are needed to balance the charge of one beryllium ion?

• One

• Two

• Three

• Four

What is the net charge of a neutral compound?

• 0

• 1-

• 1+

• 2+

What is the correct formula for beryllium hydroxide?

• Be(OH)2

• BeOH2

• Be2OH

• BeOH