According to the octet rule most elements need _______ valence electrons.

• 2
• 8
• 6
• 18

Tags

NGSS.HS-PS1-1

Metals and nonmetals form which kind of bond?

• Polar covalent
• Ionic
• Non-polar covalent
• Metallic

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the correct formula for this molecule?

• NH
• N₃H
• NH₃
• NH₄

Tags

NGSS.MS-PS1-1

Which of the following is the correct Lewis dot structure for the molecule fluorine (F₂)?

• A
• B
• C
• D

Tags

NGSS.MS-PS1-1

Which of the following is the correct Lewis structure for the compound PBr₃?

• structure A
• structure B
• structure C
• structure D

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How many electrons should Carbon have around its Lewis dot model?

• 1
• 3
• 4
• 5

Tags

NGSS.HS-PS1-1

In the correct Lewis structure for water, how many unshared pairs of electrons will oxygen have?

• 1
• 4
• 3
• 2

Which of the following is the correct Lewis structure for CH₂O?

• Option A
• Option B
• Option C
• Option D

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following elements will NOT be surrounded by an octet of electrons in a correctly drawn Lewis structure?

• carbon
• oxygen
• chlorine
• hydrogen

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following is an ionic bond?

• H₃N
• CaCl₂
• NO₂
• SCl

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-3