[He] 2s2 2p6 for O2-
The noble gas notation starts for elements after helium. Helium has no noble gas notation. Its electronic configuration is 1s2
The noble gas notation for carbon uses neon as the previous noble gas. Carbon ([He] 2s^2 2p^2) can be written in noble gas notation as [He] 2s^2 2p^2.
The electron configuration of einsteinium is [Rn]5f11.7s2.
The noble gas notation for Berkelium (Bk) is [Rn] 5f^9 7s^2.
The noble gas core notation for Se-2 is [Kr] 4d10 5s2 5p6.
The noble gas notation for Iron (Fe) is [Ar]4s2 3d6.
It is 1s2 (2 in superscript).
In full starting with 1s and through each level. The noble gas form, where only the electrons above the highest noble gas configuration are shown, the noble gas is in square brackets. Example chlorine 1s2, 2s2, 2p6, 3s2, 3p5 [Ne]) 3s2 3p5
The complete electron-configuration notation for iodine is (1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^5). In noble-gas notation, iodine can be represented as ([Kr] 4p^5), where ([Kr]) (krypton) represents the electron configuration of the preceding noble gas.
The noble gas notation of carbon is [He]2s^2 2p^2, where [He] represents the electron configuration of helium. This notation indicates that carbon has a total of 6 electrons, with 2 in the 2s orbital and 4 in the 2p orbital.
The noble gas notation for Xenon is [Kr] 4d^10 5s^2 5p^6. This notation represents the electron configuration of Xenon with the closest noble gas element, Krypton, in brackets followed by the configuration for Xenon.
[Xe] 4f14 5d10 6s2 6p5