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Metallic Bonding, Electron–sea model. |
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Answer» In case of metals, the electrons in the outermost shell (valence electrons) are loosely bound, hence they are also called as free electrons. The remainder portion of the atom is known as Kernel (which is positively charged sphere). These positively charged spheres are packed in a regular fashion. The free electrons are mobile in nature and move from one kernel to another throughout the metal lattice. Thus the metal crystal may be pictured as an arrangement of positive ions immersed in a ‘Sea of mobile electrons’. The electrons move in such a way that they are simultaneously near to two or more kernels and bind them together. The bond thus formed between the metal atoms is known as Metallic bond. Hence a metallic bond may be defined as the bond formed as a result of simultaneous attraction of an electron by two or more than two positive ions of the metal. |
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