Among the following, what is the number of elements showing only one non-zero oxidation state?

Among the following , the number of elements showing only one non-zero oxidation state is: O,Ci,F,N,P,Sn,Tl,Na,Ti

Among the following , the number of elements showing only one non-zero oxidation state is: O,C,F,N,P,Sn,Tl,Na,Ti

Among the following, the number of elements showing only one non-zero oxidation state is: O,Cl,F,N,P,Sn,Tl,Na,Ti

Among the following, the number of elements showing only one non-zero oxidation state is O,Cl,F,N,P,Sn,Tl,Na and Ti.

Among the following elements, what is the total number of elements having the lowest oxidation state of zero? Ta b.Te c. Tc d. Ti e. TI