First member of each group of representative elements (i.e., s and p-block elements) shows anomalous behaviour due to the following reasons:
• Due to small atomic size
• D-orbitals are absent.
• Ionisation enthalpy
• Electron gain enthalpy
Li is a first group element. It has different properties and forms covalent compounds and nitrides.
Beryllium is first element of second group. It has various anomalies like it forms a covalent compound with coordination number four unlike other elements that have a coordination number 6.
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