What species has the electron configuration [ar]3d2?

The species with configuration   is Titanium.

Explanation:

Given:

Electronic configuration is, .

In the given configuration [ar] represents the Argon. The atomic number of Argon is 18.

While, means that the species has two electrons in its d-subshell. And before filling the d-shell, the electron occupies s-subshell, which can contain maximum of two electrons.

So, it is clear that the species has 2 electrons in its completely filled s-subshell and 2 electron in its d-subshell. This means that species must have the atomic number of 22.

And, as per modern periodic table, the species corresponding to atomic number 22 is Titanium.

Thus, the species is Titanium.

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Explanation:

The electronic configuration of the Argon (Ar) has atomic number 18 with all its layers filled

To fill the 3d2 level, you must first fill the 4s level with its two electrons, since it has less energy so the electronic configuration of the atom would be

[Ar] 4s² 3d² corresponding to Titanium

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