(A) Beryllium nitride $(Be_3N_2)$ is covalent in nature due to the small size and high polarizing power of the $Be^{2+}$ ion. Because of its covalent

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(A) Beryllium nitride $(Be_3N_2)$ is covalent in nature due to the small size and high polarizing power of the $Be^{2+}$ ion. Because of its covalent character,it is volatile. In contrast,other alkaline earth metal nitrides are ionic and exist as crystalline solids.