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Physical properties of halogen

 Last Update: 2021-06-18
 Source: Internet
 Author: User

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The elementary halogens are all non-polar diatomic molecules.
As the atomic number increases from F ₂ to I ₂ , the atomic radius increases sequentially, and the intermolecular forces increase sequentially from top to bottom, so the melting point and boiling point of the elemental halogen Increase in turn
.

Under normal circumstances, F ₂ is a light yellow gas, CI ₂ is a yellow-green gas, Br ₂ is a red-brown liquid, and I ₂ is a purple-black crystal
.

The color of the halogen element gradually deepens with the increase of the atomic number.

Elemental F ₂ can react violently with water to decompose water to produce oxygen
.

The simple substances of chlorine , bromine and iodine have relatively low solubility in water

Br ₂ and I ₂ are more soluble in organic solvents
.

For example, the solubility of iodine in CCl ₄ is 86 times that of water, and its solubility in organic solvents such as CS _{2 is} greater

The I ₂ + the I ^- = the I _{.
3}^-

I ₃^{-When the} concentration is small, the solution is yellow.
As the concentration increases, the color of the solution deepens to brownish red
.

All halogens are harmful to health.

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