Which of the following elements where not among metals/elements named to fill the gap of Mendeleev’s Periodic Tablespaces?
A. Cobalt
B. Scandium
C. Gallium
D. Germanium
Answer:A
Which of the following elements where not among metals/elements named to fill the gap of Mendeleev’s Periodic Tablespaces?
A. Cobalt B. Scandium C. Gallium D. Germanium