Cobalt and Bromine Compounds

The video tutorial explains how to write the chemical formula for cobalt(II) bromide. It begins by identifying the element symbols for cobalt and bromine, and then discusses their ionic charges. Cobalt has a 2+ charge, while bromine has a 1- charge. The tutorial demonstrates how to balance these charges to form a neutral compound, resulting in the formula CoBr2. The video concludes with a summary of the process.

What is the element symbol for cobalt?

• Cb

• Cu

• Ca

• Co

What does the Roman numeral in Cobalt(II) indicate?

• The atomic mass of cobalt

• The number of bromine atoms

• The charge of cobalt

• The number of cobalt atoms

Which group on the periodic table does bromine belong to?

• Group 3

• Group 5

• Group 7A

• Group 1

What is the ionic charge of bromine?

• 2-

• 1+

• 1-

• 2+

What is the correct formula for Cobalt(II) Bromide?

• Co2Br

• CoBr2

• Co2Br2

• CoBr