Lewis Dot Structures - Ionic and Covalent

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

• 2
• 8
• 6
• 18

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

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

• A
• B
• C
• D

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

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

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

• 1
• 4
• 3
• 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

What is the first thing you need to do when drawing Lewis Structures?

• Draw your bonds
• Count the number of valence electrons
• Subtract to make the valence number even
• Add to make the valence number even

Tags

NGSS.HS-PS1-1

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

In a Lewis structure, what do you do  with the total number of valence if your ion is 2- charged?

• Add 2 to the valence number
• Subtract 2 from the valence number
• Multiply the valence number by 2
• Divide the valence number by 2

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

• 4
• 6
• 8
• 2

What is the correct Lewis Dot Structure for ammonia NH3

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