Answer:
[tex]Mg^{2+}[/tex]
Explanation:
Magnesium is the element of group 2 and third period. The atomic number of Magnesium is 12 and the symbol of the element is Mg.
The electronic configuration of the element Magnesium is:-
[tex]1s^22s^22p^63s^2[/tex]
Noble gas notation includes a shorthand way of writing the electronic configuration of the elements.
The nearest noble gas - Neon which has electronic configuration of - [tex]1s^22s^22p^6[/tex]
So, the noble gas notation for Magnesium is:- [tex][Ne]3s^2[/tex]
Thus, Magnesium losing 2 electrons will be isoelectronic with neon and has configuration of [tex][Ne][/tex] .
Thus, the symbol of the cation is:- [tex]Mg^{2+}[/tex]
