Cations and Anions Concepts

The video tutorial explains the concept of ions with a focus on anions, which are negatively charged ions. It provides examples such as chloride, oxygen, and nitrogen ions. The periodic table is used to illustrate the pattern of ionic charges, highlighting the positive charges of transition metals and the negative charges of nonmetals. The video also introduces polyatomic anions like sulfate and nitrate. Finally, it defines cations as positively charged ions and offers a mnemonic to remember them. The tutorial is presented by Dr. B, who summarizes the key points about anions and cations.

What is an anion?

• A neutral atom

• An ion with a positive charge

• A molecule with no charge

• An ion with a negative charge

Which of the following is an example of an anion?

• Mg2+

• Cl-

• Na+

• H2O

What charge do elements in Group 1 of the periodic table typically have?

• One plus

• Two minus

• One minus

• Three plus

Which element is typically found as a three minus ion?

• Oxygen

• Chlorine

• Nitrogen

• Sodium

What is the charge on the sulfate ion (SO4)?

• 2-

• 2+

• 1-

• 3-

What is a cation?

• An ion with a negative charge

• An ion with a positive charge

• A neutral atom

• A molecule with no charge

How can you remember that cations have a positive charge?

• The 't' in cation looks like a plus sign

• The 'n' in cation stands for negative

• Cations are always larger than anions

• Cations are found in Group 7 of the periodic table