Ion Charges and Polyatomic Ions

This video tutorial explains how to determine the charge of ions, both for individual elements and polyatomic ions. It covers the conventions for writing ionic charges, the use of the periodic table to predict charges, and the special case of transition metals with variable charges. The tutorial also introduces polyatomic ions and provides practice examples to reinforce learning.

What is the charge of a sodium ion?

• 1-

• 2-

• 2+

• 1+

Which group in the periodic table typically has a 2+ charge?

• Group 2

• Group 1

• Group 3

• Group 4

What is the charge of sulfur when it forms an ion?

• 2+

• 2-

• 1+

• 3-

How do you determine the charge of a transition metal in a compound?

• By its atomic mass

• By the charge of the ions it is bonded to

• By its atomic number

• By its position in the periodic table

What is the charge of iron in FeCl3?

• 3+

• 4+

• 2+

• 1+

Which of the following is a polyatomic ion?

• O2-

• Na+

• Cl-

• NH4+

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

• 1-

• 2-

• 1+

• 2+

Which ion is known to have a positive charge and is an exception among polyatomic ions?

• Ammonium

• Carbonate

• Hydroxide

• Nitrate

What is the charge of barium when it forms an ion?

• 1+

• 2+

• 1-

• 2-

Which ion is represented by NO3-?

• Ammonium

• Nitrite

• Nitrate

• Sulfate