MP3: Lewis Structures

Front

What is a Lewis structure?

Back

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

Front

What does the octet rule state?

Back

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

Front

How do you determine the total number of valence electrons in a molecule?

Back

To determine the total number of valence electrons, add the valence electrons of each atom in the molecule based on their group number in the periodic table.

Front

What is the significance of lone pairs in Lewis structures?

Back

Lone pairs are pairs of valence electrons that are not involved in bonding. They can affect the shape and reactivity of the molecule.

Front

What is the correct Lewis structure for BF3?

Back

The correct Lewis structure for BF3 shows boron in the center with three fluorine atoms bonded to it, and no lone pairs on boron.

Front

How do you represent double bonds in Lewis structures?

Back

Double bonds are represented by two lines between the atoms, indicating that two pairs of electrons are shared.

Front

What is the Lewis structure for water (H2O)?

Back

The Lewis structure for water shows oxygen in the center with two hydrogen atoms bonded to it and two lone pairs of electrons on oxygen.

Front

What is the molecular geometry of NH3 (ammonia)?

Back

The molecular geometry of NH3 is trigonal pyramidal due to the presence of one lone pair on the nitrogen atom.

Front

How do you identify 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 correct Lewis structure for PBr3?

Back

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