Metallic bonding is the strong attraction between closely packed positive metal ions and delocalized electrons. This bonding gives metals high melting and boiling points. Metals are good conductors of heat and electricity due to their delocalized electrons, which are free to move and transfer energy. Their dense, closely packed atomic structure results in high density as well as malleability and ductility, as the layers of atoms can easily slide past one another.

1. พันธะโลหะ
Metallic Bond

3. Metallic bonding is the strong attraction between closely packed
positive metal ions and a 'sea' of delocalised electrons.
http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_gateway/periodic_table/metalsrev2.s
html

4. High melting and boiling points
Conducting electricity
Higher tier
http://www.tutornotes.com.hk/metallic_bond/

5. เคมีเล่ม ๑ หน้ า 125
Q&A: Metal Properties
1. List the general physical properties of metals
ANSWERS.
These are general properties. It applies for most metals with certain exceptions.
•high melting and boiling point •high density
•ductile
•malleable
•shiny appearance
•good conductor of heat
•good conductor of electricity
2. Define ductile
ANSWERS . It can be stretched into wires..

6. เคมีเล่ม ๑ หน้ า 125
Q&A: Metal Properties
3. Define malleable
ANSWERS . It can be bent and hammered into sheets.
4. Describe the metallic bonding. Illustrate with a diagram.
ANSWERS . Metallic bonding is the strong forces of attraction between the positive metal
ions and the sea of delocalised electrons.These delocalised electrons
comes from the valence electrons of the atoms.

7. เคมีเล่ม ๑ หน้ า 125
Q&A: Metal Properties
5. The metallic bonds in metals are strong hence metals have high melting and boiling
points
ANSWERS . The metallic bonds in metals are strong hence metals have high melting and
boiling points.
6. Explain the ductile and malleable properties of metals in terms of their structure. Draw a
diagram to illustrate.
ANSWERS . The layers of atoms are able to slide pass each other easily
without breaking the metallic bond.
http://scienceshine.wordpress.com/2014/01/16/qa-metal-properties/

8. เคมีเล่ม ๑ หน้ า 125
Q&A: Metal Properties
.
7. Explain the good electrical conductivity of metals in terms of their structure.
ANSWERS . The delocalised electrons are able to move freely to conduct electricity.
8. Explain the good thermal conductivity of metals in terms of their structure.
ANSWERS . The closely packed structure in metals allow heat energy to be easily transferred
from one atoms to another through vibration. The sea of delocalised electrons further
enhance the heat conduction process through vibration.
9. Explain the high density of metals in terms of their structure.
ANSWERS . The atoms in atoms are closely packed resulting in high density.
http://scienceshine.wordpress.com/2014/01/16/qa-metal-properties/