Question

Why cl minus has greater atomic radius than cl

Answer 1

In cl- there are 8 electrons in the outermost shell. Its size is greater due to electron-electron repulsion.

Answer 2

SiCl4 has a larger central atom than CCl4 , which makes more vulnerable to attack in hydrolysis.The differing rates of hydrolysis are attributed to the greater atomic radius of the silicon atom allowing attack at silicon, and to the polar nature of the Si-Cl bonds favoring nucleophilic attack.

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