Electronic Configuration Questions

Given below are two statements:Statement I: Ferromagnetism is considered as an extreme form of paramagnetism.Statement II: The number of unpaired electrons in a ${\text{Cr}}^{2+}$ ion ($Z=24$) is the same as that of a ${\text{Nd}}^{3+}$ ion ($Z=60$).In the light of the above statements, choose the correct answer from the options given below:

If $n=6$, the correct sequence of filling of electrons will be:

Which one of the following ions has electronic configuration $[\text{Ar}]3d^6$?

Gadolinium belongs to the $4f$ series. Its atomic number is $64$. Which of the following is the correct electronic configuration of gadolinium?