Chemical Bonding

In chemical compounds, covalent bonds form when

• the electronegativity difference between two atoms is very large.
• electrons are completely transferred between two metals.
• pairs of electrons are shared between two nonmetal atoms.
• two nonmetal atoms are attracted to each other by opposite charges.

Predict the bond that will form between Be and F.

• Ionic
• Covalent

Predict the bond that will form between Se and Cl

• Ionic
• Covalent

Using electronegativities, what type of bond is formed by S and Br.

• ionic
• polar covalent
• non-polar covalent

Using electronegativities, what type of bond is formed by Co and F.

• ionic
• polar covalent
• non-polar covalent

Why do bonds form?

• To fill the valence shell of electrons for the elements involved
• to release energy stored in the bonds
• because whenever you mix two chemicals, there will be a reaction
• because of attraction

A substance which has a high melting point, conducts electricity when dissolved in water, and has a crystalline structure probably has what type of bond?

• Ionic

• Covalent

A compound is made of two nonmetals. It is

• ionic

• covalent

A compound forms between a metal and a nonmetal. It is

• ionic

• metallic

• covalent

Ionic compounds are held together by

• intermolecular forces

• electrostatic forces

• magnetic forces

• nuclear forces