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Question

why is Be not an alkaline earth metal sir?

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Solution

Be is very different than the other members Mg, Ca, Sr, and Ba in that it forms covalent bonds. This is evident from the

  • much lower boiling and melting point of its salts compared to the other group 2 elements.
  • In addition, beryllium hydroxide is amphoteric; that is, beryllium can interact to form a positive ion, or it can become part of a negative ion.
  • Not only can the metal form typical salts, such as beryllium sulfate (BeSO4), it can also form beryllates such as Na2Be(OH)4.
  • Be has smaller size, high effective nuclear charge, absence of d-orbital. These facts make it different from other members of alkaline earth metals.

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