Question

Which has bigger size; Cl or Cl-?

Answer 1

Cl- is bigger in size....

as in Cl- one electron is gained hence the force if attraction from from nucleus becomes weaker

and force of repulsion between the electrons become more

hence the atomic radii increases

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Answer 2

The size of Cl⁻ is bigger than Cl.

Explanation:

• The electronic configuration of chloride is Cl: [Ne] 3s² 3p⁵
• The number of electrons in chloride is 17 electrons.
• The electronic configuration of negative chloride ion is Cl: [Ne] 3s² 3p⁶
• The number of electrons in chloride is 18 electrons.
• The nucleus cannot hold 18 electrons as tightly as 17 electrons. Thus, the attraction of nucleus becomes weaker.
• There is repulsive force between electrons.
• It makes the radius of Cl⁻ bigger than Cl.