Question
Write the names of group 18 elements and their electronic configuration.
| Elements | Symbols | Atomic number | Electronic configuration |
| Helium | $He$ | 2 | $1 s^2$ |
| Neon | $Ne$ | 10 | $1 s^2 2 s^2 2 p^6$ Or $[ He ] 2 s^2 2 p^6$ |
| Argon | $Ar$ | 18 | $1 s^2 2 s^2 2 p^6 3 s^2 3 p^6$ Or $[ Ne ] 3 s^2 3 p^6$ |
| Krypton | $Kr$ | 36 | $\begin{aligned} & 1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^{10} \\ & 4 s^2 4 p^6 4 d^{10} 5 s^2 5 p^5\end{aligned}$ |
| Xenon | $Xe$ | 54 | $\begin{gathered}1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^{10} 4 s^2 4 p^6 4 d^{10} 5 s^2 5 p^6 \\ \operatorname{Or}[ Kr ] 4 d^{10} 5 s^2 5 p^6\end{gathered}$ |
| Radon | $Rn$ | 86 | $\begin{gathered}1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^{10} 4 s^2 4 p^6 4 d^{10} 4 f^{14} \\ 5 s^2 5 p^6 5 d^{10} 6 s^2 6 p^6 \\ \text { Or }[ Xe ] 4 f^{14} 5 d^{10} 6 s^2 6 p^6\end{gathered}$ |
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