Covalent Bonds and Lewis Structures

Front

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

Back

Triple bond.

Front

Which of the following is a covalent compound? H2S, KI, CaCl2, MgO

Back

H2S.

Front

When drawing Lewis structures, which electrons are used?

Back

Valence electrons.

Front

What is the correct Lewis structure for water?

Back

C.

Front

Why is the structure of nitrogen incorrect if it has 8 valence electrons?

Back

Nitrogen needs 10 valence electrons.

Front

Define a covalent bond.

Back

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

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 do you determine the central atom in a Lewis structure?

Back

The central atom is usually the least electronegative element.

Front

What is a lone pair in a Lewis structure?

Back

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

Front

What is the significance of valence electrons in covalent bonding?

Back

Valence electrons are involved in forming bonds and determining the chemical properties of an element.