Which element corresponds to the configuration [Rn] 7s² 5f¹¹?

The electron configuration [Rn] 7s² 5f¹¹ indicates that the element has a total of 11 electrons in the 5f subshell and 2 in the 7s subshell. The symbol [Rn] denotes that the configuration begins with radon, which accounts for all the preceding electrons up to that point in the periodic table.

In the actinide series, the filling of the 5f subshell occurs. Each element in this series has a specific number of electrons filling the 5f orbital. For the given configuration, the presence of 11 electrons in the 5f subshell corresponds to the element nobelium (No). Nobelium is known to have the atomic number 102, and looking at its electron configuration helps identify its placement in the periodic table.

Given this context, it is essential to understand that as you progress through the periodic table, especially in the actinide series, the electron configurations become more complex, with the f-block elements following the d-block transition metals. Therefore, the mention of specific atomic numbers also helps clarify that nobelium is indeed the correct identification for the electron configuration provided.

This detailed analysis leads us to the correct identification of the element associated