Answer:
Halides of Be are covalent because
of high sum of\[{{\Delta }_{i}}{{H}_{1}}+{{\Delta }_{i}}{{H}_{2}}\]of Be while
those of Ba are ionic due to low sum of \[{{\Delta }_{i}}{{H}_{1}}+{{\Delta
}_{i}}{{H}_{2}}\] of Ba.
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