Each element has three numbers listed under it. which value represents the atomic radius

The periodic table is frequently considered to be the “best friend” of chemists and chemistry students alike. It includes information regarding atomic masses and element symbols, but it can also be used to create predictions about atomic size, electronegativity, ionization energies, bonding, solubility, and reactivity.

 

The atomic radius which has a unit of pm is usually listed on the first number under the diagram.

Noble gases is far right

Electron equations of the given changes are as follow,a)                              cu      →      cu⁺²  + 2e⁻b)                              mg⁺²  +  2 e⁻      →      mgc)                              cl⁻    →      cl  +  1e⁻d)                              s  +  2 e⁻    →      s²⁻e)                                o²⁻      →      o  +  2 e⁻f)                              p  +  3 e⁻    →      p³⁻g)                              fe²⁺    →      fe³⁺  + 1 e⁻h)                              s²⁻    →      s⁴⁺  +  6 e⁻