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You should check the electronegativity values of Ba and O. The difference between these two will tell you what type of bond you are dealing with. A table of these values are found in a standard chemistry textbook.

However, as a rule of thumb, alkali and earth-alkali metals such as Ba, Ce, Na etc. very often form ionic bonds.

However, you should NEVER refer to something like Ba-O or NaCl or H2O as an element! Elements are the fundamental building blocks, that is, only one element, like Fe (iron). Two or more elements form a chemical substance.

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โˆ™ 2010-10-06 13:50:29
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Q: What bond does the element Ba-O have covalent or ionic?
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