Page 148 - Science Course 2 (Book 1)

Mo.5-L3b: What is Metallic Bonding?

Key Concept Metallic Bonds—Electron Pooling
Metals are good conductors of thermal energy and
What is Metallic Bonding? electricity.

How do metal atoms bond with one another?

Metals are shiny because the valence electrons at
the surface of a metal interact with light.

Covalent, Ionic, and Metallic Bond
Type of Bond What is Bonding Properties of Compounds

Covalent
• gas, liquid, or solid
(+) • low melting and boiling points
nonmetal atoms; • often not able to dissolve in water
(+) (–) nonmetal atoms • poor conductors of thermal energy
and electricity
• dull appearance
Water
Ionic • solid crystals

• High melting and boiling points
• dissolves in water
nonmetal ions;
Na + Cl – metal ions • solids are poor conductors of thermal
energy and electricity
• ionic compounds in water solutions
conduct electricity
Salt

Covalent, Ionic, and Metallic Bond
Type of Bond What is Bonding Properties of Compounds
Metallic • usually solid at room temperature
• high melting and boiling points
• do not dissolve in water
metal ions; • good conductors of thermal energy
metal ions and electricity
• shiny surface
• can be hammered into sheets and
Aluminum pulled into wires
SUMMARY

What is Metallic Bonding?

A metallic bond forms when many metal
atoms share their pooled valence electrons.

141