The notation "7s² 5f⁸" refers to the electronic configuration of an element in atomic physics. It indicates that the element has two electrons in the 7s subshell and eight electrons in the 5f subshell. This configuration suggests that the element is part of the actinides or lanthanides series, as these series involve filling the f-orbitals. Specifically, the element with this configuration is likely to be Californium (Cf), which has an atomic number of 98.
[Rn] 7s2 is the noble gas notation for radium. A link is provided to the Wikipedia article on radium.
The noble gas notation for Seaborgium (Sg) is [Rn] 5f14 6d4 7s2.
Ra, radium
[Rn] 7s2 5f1
The electron configuration of uranium is: [Rn]5f36d17s2.
The electron Configuration [Ra] 7s2 5f8 is Not Valid because Ra is basically [Rn] 7s2. However, you have Ra 7s2 5f8. You can never repeat and electron configuration piece twice, or at all.
[Rn] 7s2 is the noble gas notation for radium. A link is provided to the Wikipedia article on radium.
[Rn]7s2
Mendelevium (Md)
The noble gas notation for Seaborgium (Sg) is [Rn] 5f14 6d4 7s2.
[Rn] 5f6 7s2.
Ra, radium
[Rn]5f14 7s2 7p1
[Rn] 5f6 7s2
[Rn] 7s2 5f1
The electron configuration of uranium is: [Rn]5f36d17s2.
The element whose electronic structure is [Rn]7s2 = Raradium