Covalent Bonds and Lewis Structures

How many valence electrons does nitrogen (N) have?

• 5

• 4

• 7

• 6

Tags

NGSS.HS-PS1-1

What is the first step in drawing a Lewis Structure?

• Count all the valence electrons

• Draw single bonds between atoms

• Add lone pairs to give every atom an octet

• Determine the central atom

How many bonds does carbon typically form?

• 2

• 1

• 3

• 4

Which molecule is used as a chemical warfare agent and also in manufacturing polycarbonate?

• Phosgene (COCl2)

• Borane (BH3)

• Carbon Monoxide (CO)

• Ammonia (NH3)

Tags

NGSS.MS-PS1-3

What does one line represent in a Lewis structure?

• A lone pair of electrons

• The sharing of two electrons

• A single electron

• A double bond

Which element typically forms only one bond?

• Oxygen

• Nitrogen

• Fluorine

• Carbon

What is the total number of valence electrons in carbon dioxide (CO2)?

• 16

• 12

• 8

• 20

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following is NOT a step in drawing a Lewis structure?

• Determining the electronegativity of each atom

• Turning lone pairs into double or triple bonds

• Counting all the valence electrons

• Drawing single bonds between atoms

How many valence electrons does fluorine (F) have?

• 7

• 8

• 6

• 5

Tags

NGSS.HS-PS1-1

What pattern is observed in the number of bonds different elements make?

• It's random

• It decreases as we move from left to right in the Periodic Table

• It increases as we move from left to right in the Periodic Table

• It's the same for all elements