Types of bond: metallic bond, Physics

METALLIC BOND:

 

When positive metallic ions are surrounded by a sea of negative electrons, the solid being held together by electrostatic forces then it is called metallic bond. Metallic bonds are usually formed between solids composed of electro positive metallic atoms, such as those with three or less valance electrons. These atoms achieve stable electron configuration by 'donating' electrons to a cloud of electrons shared by atoms within the metallic compound. As a result, each atom in the compound becomes a positively charged ion core (consisting of its nucleus and core elements). The atoms are held together by attractive forces between the positive ion cores and negatively charged sea of 'delocalized' electrons. Let us first consider the example of sodium (Na). Na has one valance electron, which is in the 3rd orbital. When two Na atoms bond to form a gaseous Na2 molecule, the two valance electrons (one from each Na atom) are found primarily between the two Na nuclei. To make crystalline solid, many atoms are packed together in a regular form. In metal solids the atoms adopt a "closest packed" configuration, in which the atoms are equally spaced and space between the atoms is minimized. Electrons in diffuse orbital are not tightly constrained to a small space, and hence the interactions between the one Na atom and an adjacent Na atom or "nearest atom" are weak. Simultaneously, each atom in a metallic solid has several (up to 12) "nearest neighbour" each atom interacts with various other atoms. Therefore, the individual interactions between atoms are weak, there are various interactions, and the aggregate result is a well bonded metallic solid. The low electromagnetic metal atoms "give up". Their valance electrons allowing them to found throughout to found the "mixed" orbital of the valance band. Hence, the band of orbitals is filled to certain energy according to the number valance electron provided by all of the Na atoms in the solid. Each atom shares electrons with all its many neighbours in all directions, so these bonds are weak covalent bonds. Because the orbitals are big and diffuse, the bonds they form do not have important directional preferences. Another term frequently used to describe this type of bonding is "metallic bonding", because solids with type of bonding exhibits metallic and are therefore categorized as metals.        


 

Posted Date: 7/9/2012 7:57:41 AM | Location : United States







Related Discussions:- Types of bond: metallic bond, Assignment Help, Ask Question on Types of bond: metallic bond, Get Answer, Expert's Help, Types of bond: metallic bond Discussions

Write discussion on Types of bond: metallic bond
Your posts are moderated
Related Questions
A laser beam from 200 watt source is focused on an area of 10 -8 m 2 . Determine the magnitude of the Pointing vector of the area.


Cathode rays have: (1)Mass only (2)Charge only (3)No mass and charge (4)Mass and charge both Ans:(4)Mass and charge both

Define, with the help of diagram, the principle and working of an a.c. Generator. Write the expression for the e.m.f. generated in the coil in terms of its speed of rotation

When two objects collide like there velocities are not in the line of action of contact force then the collision is known as oblique collision. We can split also oblique collisi

An iron wire has a cross-sectional area equal to 5.00×10-6m2. Carry out the following steps to determine the drift speed of the conduction electrons in the wire if it carries a cur

Analogue multimeter: Even the most basic analogue multimeter can prove to be invaluable when in the hands of an experienced user. Simple measurements of voltage, current and r

When designing & constructing Inductance standards, what considerations must be taken into account? Ans: Construction of Inductors: Constructional features of an inductor

SHAPE MEMORY ALLOYS: A group of metallic materials that can return to some previously defined shape or size when subjected to the appropriate thermal producer. That is to say, s

Highest electrical resistivity exists in which wire??? nichrome wire.