The halides in higher oxidation state posses high charge and are smaller in size as compared to the lower oxidation state halides.
Thus, in higher oxidation halides the charge/radius ratio is higher which contribute to the increase in polarisation and consequently these are more covalent.
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due to inert pair effect
Stannic chloride (SnCl4) is covalent rather than ionic. This compound is composed of a metal (tin) and a non-metal (chlorine), and the electronegativity difference between them is not high enough to result in the transfer of electrons to form ions. Instead, the atoms share electrons to form covalent bonds.
Cl-Cl is more covalent than H-Cl
Covalent bond is more common than ionic bond.
Polar covalent. C is more electronegative than Si.
due to inert pair effect
When Tin and chlorine combine it creates either:-SnCl2, called tin(II) chloride, stannous chloride. This is molecular in the gas phase and forms polymeric covalent chains in the solid (mp. 247 anhydrous form)), but dissolves to form Sn2+ which may hydrolyse. The electronegativity difference is only 1.2 so it would be expected to be covalent rather than ionic.A covalent molecular compound SnCl4, tin(IV) chloride, stannic chloride, tin tetrachloride.
Covalent bonds are generally less soluble in water compared to ionic bonds. Ionic compounds dissolve in water because of the attraction between the ions and the polar water molecules. In contrast, covalent compounds are usually nonpolar or have weaker polar bonds, making them less likely to interact with polar water molecules and dissolve.
Cl-Cl is more covalent than H-Cl
Covalent bond is more common than ionic bond.
Covalent compounds are more flammable when compared to ionic compounds.Ionic compounds are more soluble in water than covalent compounds.for more go to: difference between . net
Iodine typically forms one covalent bond, since it has seven valence electrons and needs to gain one more electron for a full outer shell.
Polar covalent. C is more electronegative than Si.
No, silicon can form only four covalent bonds.
Because oxygen is much more electronegative than carbon, the bonding in CO (carbon monoxide) is a polar covalent.
Nucleic acids would be one example of a covalent compound with more than 3 elements. Proteins have more than 3 elements as well. Many organic compounds do, it is quite common.
Nonmetals, such as carbon, nitrogen, oxygen, and sulfur, typically form covalent compounds. These elements have high electronegativity values and tend to share electrons with other nonmetals to achieve a stable electron configuration.