What are the similarities and differences between $Mg$ and $Mg^{2+}$?

(N/A) $Mg$ is a neutral atom,while $Mg^{2+}$ is a positively charged cation.
The radius of $Mg$ is greater than the radius of $Mg^{2+}$ $(r_{Mg} > r_{Mg^{2+}})$.
The number of electrons in $Mg$ and $Mg^{2+}$ is different. $Mg^{2+}$ has two fewer electrons than $Mg$.
$Mg$ is the parent element,and $Mg^{2+}$ is the cation derived from it.
Similarity: Both $Mg$ and $Mg^{2+}$ have the same nuclear charge $(Z = 12)$. However,the effective nuclear charge experienced by the outermost electrons is higher in $Mg^{2+}$.