MCQ
The element having the electronic configuration $1{s^2},$ $2{s^2}\,2{p^6},\,3{s^2}\,3{p^1}$ is
- AA transition element
- ✓A representative element
- CAn inert gas
- DAn inner-transition element
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Reason : The only property that determines its aromatic behaviour is its planar structure.

$\mathrm{Eu}, \mathrm{Cm}, \mathrm{Er}, \mathrm{Tb}, \mathrm{Yb}$ and $\mathrm{Lu}$