Which elements were identified by spectroscopy of their minerals?

Variable valency is shown by

Given below are two statements:
Statement $I$: $Cr^{2+}$ is oxidising and $Mn^{3+}$ is reducing in nature.
Statement $II$: $Sc^{3+}$ compounds are repelled by the applied magnetic field.
In the light of the above statements,choose the most appropriate answer from the options given below:

Select the $CORRECT$ set of group number and period of element $Uub$ (Ununbium,now known as Copernicium,$Cn$).

Which of the following has second ionisation potential less than expected?

Which of the following pairs has a similar magnetic moment?