Covalent Model

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

• 1
• 2
• 3
• 4

Tags

NGSS.HS-PS1-1

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

• 2
• 8
• 6
• 18

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Hydrogen needs _____ electrons in its valence shell to be stable.

• 4
• 6
• 8
• 2

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

• A
• B
• C
• D

If electrons are shared unequally then the bond is....

• Non-polar covalent
• Ionic
• Non-polar ionic
• Polar covalent

Which is the correct structure for NH₃?

Pictures correspond with a-d.

• Option A.

• Option B.

• Option C.

• Option D.

Tags

NGSS.HS-PS1-4

After drawing in your bonds, what do you do if you don't have enough electrons to get each atom to its octet?

• Place dots until everything has eight
• Place dots only around the terminal atoms
• Add a multiple bond
• Have eight only around the central atom

Tags

NGSS.HS-PS1-1

How many covalent bonds does carbon need to form in order to have a full octet?

• 2
• 3
• 4
• 5

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

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

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