Anomalous Behaviour of Beryllium Beryllium , the first member of alkaline earth metals, show an anomalous behaviour , i.e. differ from the rest of the members of its family. The main reason for this difference are as follow: 1) Exceptionally small atomic and ionic size. 2) High ionisation enthalpy 3) Absence of d-orbital in its valence shell Some important … [Read more...] about Anomalous Behaviour of Beryllium