it's an up arrow and down arrow next to each other, beneath that it says 1s2.
The noble gas notation starts for elements after helium. Helium has no noble gas notation. Its electronic configuration is 1s2
The isotopic notation for helium-4 is ^4He. This notation denotes the element's atomic number and mass number, which for helium-4 are 2 (atomic number) and 4 (mass number) respectively.
There is no boble gas notation for hydrogen and helium. The noble gas notation starts for elements after helium. The noble gas notation is a notation formed as a result of the electron configuration notation being used in conjunction with noble gases. The noble gas preceding the element in question is written then the electron configuration is continued from that point forward.
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 electron configuration of carbon in noble gas notation is [He] 2s^2 2p^2. This notation indicates that carbon has the same electron configuration as helium up to the 1s orbital, followed by the electron configuration of the remaining orbitals (2s^2 2p^2).
The noble gas notation starts for elements after helium. Helium has no noble gas notation. Its electronic configuration is 1s2
Electron configuration of helium: 1s2
The isotopic notation for helium-4 is ^4He. This notation denotes the element's atomic number and mass number, which for helium-4 are 2 (atomic number) and 4 (mass number) respectively.
It is 1s2 (2 in superscript).
There is no boble gas notation for hydrogen and helium. The noble gas notation starts for elements after helium. The noble gas notation is a notation formed as a result of the electron configuration notation being used in conjunction with noble gases. The noble gas preceding the element in question is written then the electron configuration is continued from that point forward.
He2s1 is a chemical notation for a helium atom that has one electron in the 2s subshell. This notation is commonly used to represent the electron configuration of an atom.
Three sublevels: px, py, pz
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 electron configuration of carbon in noble gas notation is [He] 2s^2 2p^2. This notation indicates that carbon has the same electron configuration as helium up to the 1s orbital, followed by the electron configuration of the remaining orbitals (2s^2 2p^2).
The noble gas notation is a notation formed as a result of the electron configuration notation being used in conjunction with noble gases. The noble gas preceding the element in question is written then the electron configuration is continued from that point forward. The notation is shorter to write and makes it easier to identify elements. The noble gas notation starts for elements after helium. For example, the electronic configuration of carbon is 1s2 2s2 2p2, whereas its noble gas notation is [He] 2s2 2p2.
The noble gas notation is a notation formed as a result of the electron configuration notation being used in conjunction with noble gases. The noble gas preceding the element in question is written then the electron configuration is continued from that point forward. The notation is shorter to write and makes it easier to identify elements. The noble gas notation starts for elements after helium. For example, the electronic configuration of carbon is 1s2 2s2 2p2, whereas its noble gas notation is [He] 2s2 2p2.
He - Helium