Lewis Structures and Valence Electrons

The video tutorial explains how to use Lewis symbols to represent compounds containing polyatomic ions. It covers the drawing of Lewis symbols for sodium oxide and sodium carbonate, including the steps to create the Lewis structure for the carbonate ion. The tutorial also discusses resonance structures and provides exercises for KNO3 and NH4Cl, demonstrating how to draw their Lewis structures.

What is the Lewis symbol for a sodium ion in sodium oxide?

• Na with zero dots

• Na with one dot

• Na with three dots

• Na with two dots

Why do sodium ions repel each other in sodium oxide?

• Because they are neutral

• Because they have the same charge

• Because they are attracted to the oxide ion

• Because they have opposite charges

How many valence electrons does a carbonate ion have?

• 24

• 20

• 18

• 26

Which atom is the central atom in the carbonate ion skeleton?

• Oxygen

• Carbon

• Sodium

• Hydrogen

How many lone pairs are present in the carbonate ion after forming bonds?

• 8

• 6

• 12

• 9

What is the charge of the nitrate ion in KNO3?

• +1

• -1

• +2

• -2

How many valence electrons does the NH4+ ion have?

• 12

• 8

• 6

• 10

What is the Lewis structure for a chloride ion in NH4Cl?

• Cl with 6 dots

• Cl with 7 dots

• Cl with 5 dots

• Cl with 8 dots

What is the total number of electrons in the Lewis structure of NH4+?

• 8

• 7

• 9

• 6

In the Lewis structure of NH4Cl, which ion is the cation?

• Na+

• K+

• Cl-

• NH4+