Although hydrides can be formed with almost all main-group elements, the number and combination of possible compounds varies widely; for example, there are over 100 binary borane hydrides known, but only one binary aluminium hydride. Binary indium hydride has not yet been identified, although larger complexes exist. COUNT 2
QSN1 How many binary borane hydrides are known? ANS1 over 100 QSN2 How many binary aluminum hydrides are there? ANS2 1