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Metallic Solids:
The solids whose particles (atoms) are bonded together by means of metallic bonds are known as Metallic solids.
All the metals are metallic solids because their atoms are bonded together by means of metallic bond. The behavior of metallic bond is different from ionic, covalent bond and Vander Waals forces. The formation of metallic bond can be explained by “Electron gas theory” which is presented by “Loren” in 1923.
According to this theory, due to large atomic size, the valence electrons of the atoms of metals get out of them and arrange around the positively charged metals ions like a pool or a gas or as a sea.
The electrons which are in b/w the positively charge metals ions are attracted by these positive ions and thus these positively charged metal ions get attached to each other. This force of attraction is known as metallic bond.
Properties:

Due to strong metallic bonds metallic solids are very hard and can’t be compressed easily.
They have high melting point & boiling point and are non-volatile.
They are good conductors of heat and electricity because of the presence of free electrons.

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