(A) For an atom of Sn, indicate the number of 

(a) Electronic shells that are either filled or partially filled; 

(b) 3p electrons; 

(c) 5d electrons; and 

(d) Unpaired electrons.

(B) Indicate the number of 

(a) Electrons in Y atoms; 

(b) Electrons in Ge atoms; and 

(c) Unpaired electrons in Au atoms.