If the elements achieve the following ions then they are likely to attain the noble-gas configurations. The example of elements attaining ionic forms are given below:
[Ne], N3−
[Ar], Ca2+
[Ar], S2−
[Kr], Br−
Noble gas configuration refers to the symbol of the last Nobel gas and the configuration of the remaining electrons of the atom preceding that Nobel gas.
According to the Nobel gas configuration, if an atom has 8 electrons in the valence shell then it becomes the most stable atom.
All noble gases have eight electrons in their outermost shells making them the most stable and inert elements of the periodic table.
For example, the Neon symbol refers to the standard Nobel gas configuration thus making the noble gas configuration for sodium [Ne]3s1.
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