Question
Besides gallium, which two other elements have since been discovered for which Mendeleev had left gaps in his periodic table?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$\text{NH}_3\ +\text{CuO}\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }\text{Cu}+\text{N}_2+\text{H}_2\text{O}$