Cadmium and Sulfide Chemistry Concepts

The video tutorial explains how to write the chemical formula for cadmium sulfide. It begins by identifying the symbols for cadmium (Cd) and sulfide (S) and discusses the importance of considering charges due to cadmium being a transition metal. Cadmium typically has a 2+ charge, while sulfide has a 2- charge. The tutorial demonstrates how these charges balance to form a neutral compound, resulting in the formula CdS. It also covers naming conventions, noting that while cadmium is a transition metal, the Roman numeral II is often omitted because cadmium is almost always 2+. The video concludes with a brief closing statement.

What is the element symbol for cadmium?

• Cm

• Cd

• Ca

• C

Which group does sulfur belong to in the periodic table?

• Group 17

• Group 16

• Group 15

• Group 14

What is the typical charge of a cadmium ion?

• 0

• 2+

• 3+

• 1+

How do the charges of cadmium and sulfide ions combine to form cadmium sulfide?

• 0 and 0

• 3+ and 3-

• 2+ and 2-

• 1+ and 1-

What is the chemical formula for cadmium sulfide?

• Cd2S3

• CdS

• Cd2S

• CdS2

Why is it sometimes unnecessary to use Roman numerals when naming cadmium sulfide?

• Cadmium always has a 1+ charge.

• Cadmium is not a transition metal.

• Cadmium forms multiple ions.

• Cadmium is almost always 2+.