Lesson Check Lewis Dot Structures for Covalent Comp (2024-2025)

Front

What is a Lewis dot structure?

Back

A Lewis dot 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

How many valence electrons does fluorine (F) have?

Back

Fluorine has 7 valence electrons.

Front

What is the Lewis dot structure for the molecule F₂?

Back

The Lewis dot structure for F₂ shows two fluorine atoms sharing a pair of electrons, each represented by a dot.

Front

How many lone pairs are present in ammonia (NH₃)?

Back

Ammonia (NH₃) has 1 lone pair of electrons on the nitrogen atom.

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 many electrons does hydrogen need to achieve stability?

Back

Hydrogen needs 2 electrons in its valence shell to be stable.

Front

What is the Lewis structure for PBr₃?

Back

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

Front

What is a lone pair of electrons?

Back

A lone pair of electrons is a pair of valence electrons that are not shared with another atom and are not involved in bonding.

Front

What is the octet rule?

Back

The octet rule states that atoms tend to bond in such a way that they have eight electrons in their valence shell, achieving a stable electron configuration.

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.