Which of the following species has the largest ionic radius

Which of the following statements is correct about ionization energy? It

Potassium trioxonitrate (V) can be obtained from its solution by----------

An element, Q, contains 69% of\(^{63}\)Q and 31% of \(^{65}\)Q. What is the relative atomic mass of Q?

The following ions have the same electron configuration except 

\(_{8}\)O, \(_{12}\)Mg, \(_{13}\)AI, \(_{17}\)CI