Lewis Structures (All Types)

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

• A
• B
• C

Tags

NGSS.MS-PS1-1

What is the correct formula for this molecule?

• Si₄F
• SiF₄
• SiF
• Si₄F₄

Identify the central atom in each of the following molecules:

CO₂ ​ (a)  

PH₃ ​ (b)  

SiO₂ ​ (c)  

• carbon
• phosphorus
• silicon
• hydrogen
• oxygen

Tags

NGSS.MS-PS1-1

The number of electrons that should be included in the picture of NH₄ is 9. The number of electrons in the picture for NH₄⁺ is 8. Offer an explanation for why NH₄⁺ has 8 electrons instead of 9.

• The positive charge indicates the loss of one electron, leading to 8 electrons.

• There is a calculation error; NH₄⁺ should have 9 electrons.

• Electrons are shared with another atom, reducing the count to 8.

• NH₄⁺ has actually gained an electron and has 9 electrons.

Tags

NGSS.HS-PS1-2

Which of the following is true about expanded octets? (Check all that apply.)

• Any element can have an expanded octet.

• Elements in row 3 and lower on the periodic table can have expanded octets.

• An expanded octet is when an element has less than 8 electrons.

• An expanded octet is when an element has more than 8 electrons.

• An expanded octet is when an atom has an unpaired set of electrons in its outer shell.

Tags

NGSS.HS-PS1-2

• follows the octet rule

• is an incomplete octet

• is an expanded octet

• is a free radical

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

• follows the octet rule

• is an incomplete octet

• is an expanded octet

• is a free radical

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

• follows the octet rule

• is an incomplete octet

• is an expanded octet

• is a free radical

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

• follows the octet rule

• is an incomplete octet

• is an expanded octet

• is a free radical

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

• follows the octet rule

• is an incomplete octet

• is an expanded octet

• is a free radical

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1