7.2C Covalent Lewis Structures

Front

What is a covalent bond?

Back

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.

Front

What is the Lewis structure of a molecule?

Back

The Lewis structure is a diagram that shows the bonding between atoms of a molecule and the lone pairs of electrons that may exist.

Front

How do you determine the central atom in a Lewis structure?

Back

The central atom is usually the least electronegative atom or the atom that can form the most bonds.

Front

What is the significance of lone pairs in Lewis structures?

Back

Lone pairs represent non-bonding electrons that can affect the shape and reactivity of the molecule.

Front

What is the octet rule?

Back

The octet rule states that atoms tend to form bonds until they are surrounded by eight valence electrons.

Front

How many valence electrons does nitrogen (N) have?

Back

Nitrogen has 5 valence electrons.

Front

What is the Lewis structure for ammonia (NH3)?

Back

The Lewis structure for ammonia shows nitrogen in the center with three hydrogen atoms bonded to it and one lone pair of electrons.

Front

What type of bond is present in HCN between carbon and nitrogen?

Back

The bond between carbon and nitrogen in HCN is a triple bond.

Front

How many unshared electron pairs surround the carbon in CH4?

Back

In CH4, there are 0 unshared electron pairs surrounding the carbon.

Front

What is the correct Lewis structure for PBr3?

Back

The correct Lewis structure for PBr3 shows phosphorus in the center bonded to three bromine atoms with one lone pair of electrons.