Lewis Structures and Valence Electrons

The video 'Lewis Structures Made Easy' by Ketzbook reviews the five basic steps for drawing Lewis structures and provides practice examples with N2, O2, F2, and CO2. It introduces patterns of bonding for different elements and an alternate method for drawing Lewis structures. The video explains how to count valence electrons, determine central atoms, draw bonds, and ensure atoms achieve an octet. It also discusses challenges with the alternate method using examples like NH3, COCl2, and borane. The video concludes with a trivia question about the most toxic compound mentioned.

What is the first step in drawing a Lewis structure?

• Determine the central atom

• Count all the valence electrons

• Draw single bonds between atoms

• Add lone pairs to atoms

How many valence electrons does each nitrogen atom have in N2?

• 6

• 5

• 4

• 3

In the Lewis structure of O2, how many valence electrons are there in total?

• 14

• 10

• 12

• 16

How many bonds does fluorine typically form?

• 4

• 2

• 1

• 3

What is the total number of valence electrons in CO2?

• 16

• 18

• 14

• 12

Which element is the central atom in the Lewis structure of CO2?

• Oxygen

• Carbon

• Hydrogen

• Nitrogen

How many bonds does carbon typically form?

• 3

• 4

• 1

• 2

What is the alternate method for drawing Lewis structures based on?

• The number of bonds each atom wants

• The number of valence electrons

• The atomic mass

• The number of lone pairs

In the alternate method, which atom is placed in the middle?

• The atom with the lowest atomic number

• The atom with the highest atomic number

• The atom with the most bonds

• The atom with the least valence electrons

What is the correct Lewis structure for borane (BH3)?

• Boron with 2 single bonds and two lone pairs

• Boron with 3 single bonds and one lone pair

• Boron with 3 single bonds and no lone pairs

• Boron with 4 single bonds and one lone pair