Question

Give the symbol for the cation possessing a positive two charge that is isoelectronic with neon.

Answer 1

`Mg^(2+)`

Step-by-step 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:-

`1s^22s^22p^63s^2`

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 -
`1s^22s^22p^6`

So, the noble gas notation for Magnesium is:-
`[Ne]3s^2`

Thus, Magnesium losing 2 electrons will be isoelectronic with neon and has configuration of
`[Ne]` .

Thus, the symbol of the cation is:-
`Mg^(2+)`