Lewis dot structures

Reorder the following in ascending order of priority

• If all else fails, underline the less electronegative atom

• 1. If carbon is not present, then underline the element with the fewest number of atoms 

• If Carbon is present, then underline Carbon

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Reorder the following in ascending order

• Count the number of valence electrons

• Draw an accurate version of lewis dot structures

• Underline the central atom

How many valence electrons are present in a molecule of PCl3

• 26

• 21

• 5

• 4

Tags

NGSS.HS-PS1-1

Is the diagram of PCl3 accurate?

• The structure is correct because there is a total of 26 electrons and each atom has fulfilled octet

• The structure is incorrect because there are 8 electrons around each atom

• The structure is incorrect because there are no lone pairs on Phosphorous

• The structure is incorrect because Cl only needs 2 electrons to fufill octet

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

NGSS.HS-PS1-3

Which molecule should be the central atom?

Answer explanation

1. If Carbon is present, then underline Carbon 

2. If carbon is not present, then underline the element with the fewest number of atoms 

3. If all else fails, underline the less electronegative atom

Tags

NGSS.HS-PS1-3

Look at the picture and determine if it is accurate

• The structure is correct because Nitrogen has 8 electrons

• The structure is correct because Nitrogen needs 8 Valence electrons to fulfill octet

• The structure is incorrect because Nitrogen needs 10 valence electrons and the image has 8 valence electrons

• The structure is incorrect because there is no lone pairs on nitrogen

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Looking at the molecule of Br2, which of the following correctly represents the number of shared

and unshared electrons in the diagram?

• 14 shared electrons, 0 unshared electrons

• 2 shared electrons, 12 unshared electrons

• 1 shared electrons, 12 unshared electrons

• 2 shared, 24 unshared

Tags

NGSS.HS-PS1-2

Which of the following correctly represents the Lewis structure of PBr2?

• 
• 
• 

Tags

NGSS.HS-PS1-1

Draw the image of Br2

Draw the image of CF4