In the gas phase SnCl2 is Bent/Angular molecule which in Lewis terms has 2 electron pair bonds and an additional two electrons. Usually drawn as a pair.
In the solid chlorine atoms from one SnCl2 unit donate a a pair of electrons to the next to ensure each Sn achieves its octet.
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The structure of SnCl2 is trigonal planar. It consists of a tin atom in the center with two chlorine atoms bonded to it, each with a lone pair of electrons. The molecule is non-linear due to the lone pairs on the chlorine atoms.
When SnCl4 is heated, it undergoes thermal decomposition to form SnCl2 and Cl2 gases. The decomposition reaction is: 2 SnCl4 (s) -> 2 SnCl2 (s) + Cl2 (g)
SnCl2 is solid because it has a higher melting point due to its crystal lattice structure, which is more stable in the solid state. SnCl4 is liquid at room temperature because it has weaker intermolecular forces between its molecules, allowing them to move more freely and thus exist in a liquid state.
It forms SnCl2 . It is called Stannous Chloride
An Internal Structure is the way an organism looks on the outside and an External Structure is the looks on the outside.
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