Helium has an atomic number of 2 and is the first noble gas. As a noble gas, it means that its outer shell is completely filled. There is only one shell, and it is 1s, so the configuration is 1s2.
The electron configuration for oxygen is [He]2s2.2p4.The electron configuration for sulfur is [Ne]3s2.3p4.
The electron configuration for beryllium, Be, is 1s22s2.
A cation has a depleted electron configuration.
The electronic configuration of einsteinium is: [Rn]5f11.7s2.
Hydrogen electron configuration will be 1s1.
The electron configuration of francium is [Rn]7s1.
The electron configuration of beryllium is written as [He] 2s2. This means that it has 2s2 electrons above the configuration of Helium.
Uranium electron configuration: [Rn]5f36d17s2
The electron configuration of beryllium is 1s2 2s2.
The electron configuration of boron is [He]2s2.2p1.
The electron configuration for germanium is [Ar]3d10.4s2.4p2.
The electron configuration for V3 is Ar 3d2.