Suggest explanations for the following observations.
(a) The energy released when a mole of crystalline BaO is formed from its constituent ions is less than that released when a mole of MgO forms from its ions. (Each compound possesses an NaCl-struclure.)
(b) Despite being a covalent solid, BeF2 is very soluble in water.
(c) At 298 K, Be adopts an hep lattice; above 1523 K, the coordination number of a Be atom in elemental beryllium is 8.
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