Question 1
Who first presented a periodic table for classifying the elements?
The right answer is the one marked above.
The Russian scientist Dmitri Mendeleev.
Rutherford and Bohr belong to the atomic model. Pauling gave his name to the electronegativity scale you meet in section 3.5. Mendeleev did his work before anyone knew electrons existed — which makes it the more remarkable that the pattern he found was the right one.