Which of the following elements belongs to the actinide series?

In the context of the lanthanoids,which of the following statements is not correct?

The ion with $4f^7$ configuration is

What are inner transition elements? Decide which of the following atomic numbers are the atomic numbers of the inner transition elements: $29, 59, 74, 95, 102, 104$.

If the ionic radius of $_{57}La^{3+}$ is $1.06 \ \mathring{A}$,then the ionic radius of $_{71}Lu^{3+}$ will be approximately close to which of the following values in $\mathring{A}$?

Which among the following lanthanoids shows only $+3$ oxidation state?