From the following choices: Cl negative, Ne , Ar or F negative, the answer is Cl negative.
Here are the values of the above mentioned element:
Chlorine 79 pm
Neon 38 pm
Argon 71 pm
Fluorine 42 pm
See Atomic Radius for all the elements in the Periodic Table to compare.
The radius of a negative ion always greater than the radius of its neutral atom because repulsion between electrons increases.
In fact, the negative ion can be more than twice as large as the neutral atom.
Atomic radius is generally stated as being the total distance from an atom’s nucleus to the outermost orbital of electron.
In simpler terms, it can be defined as something similar to the radius of a circle, where the center of the circle is the nucleus and the outer edge of the circle is the outermost orbital of electron.
The periodic table greatly assists in determining atomic radius and presents a number of trends.
Learn more about atomic radii on UCDavis.edu.