Question

1. is the radius of a cl- ion equal, greater, or less than a neon atom? explain.

Explanation:

The $Cl^-$ ion has 18 electrons and 17 protons. Neon has 10 electrons and 10 protons. The $Cl^-$ ion has an extra - electron shell compared to neon. Also, the effective nuclear charge on the out - most electrons in $Cl^-$ is less than that in neon due to the shielding effect of inner electrons. So, the electron - electron repulsions in $Cl^-$ cause it to expand, making its radius larger.

Answer:

The radius of a $Cl^-$ ion is greater than a neon atom.