Question

How do you determine if and ion has a
noble-gasconfiguration?

Answer 1

Step-by-step explanation:

Noble gas configuration is defined as the configuration which contains completely filled orbitals.

For example, oxygen atom when gain two electrons then it forms oxygen ion (
`O^(2-)`).

Atomic number of oxygen atom is 8 and so, its number of electrons will also be 8. But when it gain two electrons then it has total 10 electrons. Hence, electronic configuration of
`O^(2-)` is as follows.

`1s^(2)2s^(2)2p^(6)`

Since, there are completely filled orbitals in an
`O^(2-)` ions. Therefore, it means this ion has a noble-gas configuration.

Thus, we can conclude that any specie which shows completely filled orbitals will have noble-gas configuration.