Radon is a noble gas; it has 8 electrons in its outer shell.
Radon!
[Rn] 7s2 is the noble gas notation for radium. A link is provided to the Wikipedia article on radium.
The noble gas electron configuration of radon is [Xe]4f145d106s26p6.
The electron configuration of hassium is: [Rn]5f14.6d6.7s2.
The electron configuration of the element with the atomic number 39 (yttrium) is: [Kr]4d15s2.
The element with that electron configuration is Iron.
The electron configuration of sulfur is [Ne) 3s2.3p4.
Sulfur (S) has the electron configuration 1s22s22p63s23p4.
1s2 2s2 2p6 3s2 3p3 is the electron configuration of element 15.
The electron configuration of phosphorus is [Ne]3s2.3p3.
The electron configuration of americium is [Rn]5f7.7s2.
[He] 2S2 is the noble gas electron configuration for beryllium.