The document explains metallic bonding, focusing on how metals crystallize in close-packed structures and the interaction between positive metal ions and delocalized electrons. It presents two models for understanding metallic bonding: the band model and the electron sea model, detailing the effects on electrical and thermal conductivity. Additionally, it notes that electrical conductivity decreases with increasing temperature due to thermal agitation of metal ions.

1. Metallic Bond | Google Science
In the metallic bond, most metals crystallize in close- packet
structures. There is a strong electron interaction among 8
to 12 nearest neighbour atoms.Also called as coordination
number.This develops the ability in metals to conduct
electricity and heat.
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2. How Metallic Bond Form
Bonding in metals results from electrical attraction
among positive charge metal ions and mobile,
delocalised electrons belonging to crystal as a whole.
Two models.
1.Band model
2.Electron Sea model
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3. Explanation of Metallic Bond
We can explain metallic bond with the help of two models.
1.Band model
2.Electron Sea model
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Band Model
The interaction of two atomic orbitals, say 3s- orbitals of two sodium atoms, produces
two molecular orbitals, one bonding orbitals and one antibonding orbitals .If N atomic
orbitals interact, N molecular orbitals are form. Atoms interact more strongly with
nearby atoms than those of farther away. The energy that separates bonding and
antibonding molecular decreases the interaction (overlap) between the atomic orbital
decreases.
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4. http://googlegalaxyscience.com/metallic-bond/
According to the band theory, the highest energy electrons of metallic
crystals occupy either full band or partially band that overlap an empty
band. A band within which(or into which) electrons must move to allow
electrical conduction we call as conduction band. The electrical
conductivity of metal decreases as temperature increases. The increase in
temperature causes thermal agitation of metal ions.This impends the flow
of electrons when an electric field is apply.
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5. Metals have the ability to conduct electricity and heat.Also formation into
sheet drawn, into wires and lustrous appearance. One over a simplified
model that can account for some of the properties is electron sea model.
The metals picture as a network of positive ions immersed in a "sea of
electrons". In Lithium, the ions would be Li+ and one electron per atom
would be contribute to sea. These free electrons account for the
characteristic metal properties. If metals ends are connect to the external
source of electric current.Free electrons from one end cross through
metal.Then,leave the other end at the same rate in thermal conductivity
in an electron.
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Electron Sea model
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