Which of the following is the third member of the Dobereiner triad, that also features Lithium and Sodium?_x005F_x000D_

Which of the following is the third member of the Dobereiner triad, th

1.	Which of the following is the third member of the Dobereiner triad, that also features Lithium and Sodium?_x005F_x000D_
A.	Potassium
B.	Boron
C.	Barium
D.	Hydrogen
Answer» B. Boron