Ions and Their Charges

The video tutorial explains the concept of ions, focusing on cations and anions. Cations are ions with a positive charge, such as sodium (Na+), iron (Fe2+), and aluminum (Al3+), which lose electrons to form bonds. The periodic table shows trends for positive ions, with group one elements forming +1 ions. Polyatomic cations like H3O+ and NH4+ are also discussed. Anions, on the other hand, have a negative charge. The video concludes with a brief overview of these concepts.

What is a cation?

• 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 a cation?

• O2-

• Cl-

• H2O

• Na+

How many electrons has the iron 2 ion (Fe2+) lost?

• Four

• Three

• Two

• One

Which group in the periodic table forms 1+ ions?

• Group 4

• Group 3

• Group 2

• Group 1

Where are transition metals located on the periodic table?

• On the far left

• At the bottom

• On the far right

• In the middle

Which of the following is a polyatomic cation?

• OH-

• NH4+

• CO3^2-

• SO4^2-

What is the charge of the ammonium ion (NH4+)?

• Neutral

• Positive

• Variable

• Negative

What is an anion?

• A neutral atom

• An ion with a negative charge

• An ion with a positive charge

• A molecule with no charge

Which of the following is a mnemonic to remember anions?

• Think of a negative ion

• Think of a positive sign

• Think of a charged molecule

• Think of a neutral atom