Formal Charge and Resonance

Front

What is Formal Charge?

Back

Formal Charge is a theoretical charge assigned to an atom in a molecule, calculated based on the number of valence electrons, the number of non-bonding electrons, and the number of bonds.

Front

How is Formal Charge calculated?

Back

Formal Charge = (Valence Electrons) - (Non-bonding Electrons) - 0.5*(Bonding Electrons)

Front

What does an expanded octet mean?

Back

An expanded octet refers to a situation where an atom has more than eight electrons in its valence shell, often seen in elements from the third period and beyond.

Front

What is a resonance structure?

Back

A resonance structure is one of two or more valid Lewis structures for a molecule that cannot be represented accurately by a single Lewis structure.

Front

How many resonance structures can SO2 have?

Back

SO2 can have 2 resonance structures.

Front

What is the significance of resonance in chemistry?

Back

Resonance allows for a more accurate depiction of the electron distribution in a molecule, leading to a better understanding of its reactivity and stability.

Front

What is a hypervalent molecule?

Back

A hypervalent molecule is one that has more than eight electrons around a central atom, typically involving elements from the third period or higher.

Front

What is the formal charge of nitrogen in a neutral molecule?

Back

The formal charge of nitrogen in a neutral molecule is typically 0.

Front

How many electrons are used in the Lewis structure for NO3-?

Back

The Lewis structure for NO3- uses 24 electrons.

Front

What is the octet rule?

Back

The octet rule states that atoms tend to form compounds in ways that give them eight valence electrons, achieving a stable electron configuration.