Answer: Sulfur (S)
Explanation: An ion with the same electron configuration as Ar has the same number of electrons as Ar. Because the ion has a −2 charge, a neutral atom of the element has 2 fewer electrons than Ar. The number of electrons in a neutral atom is equal to the atomic number. When sulfur, S, gains two electrons, it has the same configuration as Ar. Sulfur has an electron configuration of 1s²2s²2p⁶3s²3p⁴ (1s2 2s2 2p6 3s2 3p4) meaning it is 2 away from having a noble gas configuration (its charge is −2). So the ion's configuration is 1s²2s²2p⁶3s²3p⁶ (1s2 2s2 2p6 3s2 3p6). Alternately, this can be written as [Ne]3s²3p⁶ or [Ar].
The element is referred to as Sulphur.
Argon is an element that has an electric configuration of 1s² 2s² 2p6 3s² 3p6
but Sulphur has an electronic configuration of 1s² 2s² 2p6 3s² 3p4 .
In order to achieve an octet structure , Sulphur which has an atomic number
and electron of 16 has to accept two electrons to fill its outermost shell
thereby becoming negatively charged.
The element accepts two electrons to form a stable structure and the symbol after this reaction is S²⁻ .
This can also be written as [Ne]3s²3p⁶ or [Ar].
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