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All atoms have some covalent character, but the atoms can have more ionic character (aka less covalent character) if there is a greater difference in electronegativity between the atoms. This also means that atoms with more covalent character (aka less ionic character) has a smaller difference in electronegativity between atoms.
In looking at a coordinate covalent bond specifically, where two shared electrons are coming from the same atom, it's probably best to look at the Lewis structure and look at how the bond formed in the first place from reaction (where by looking at the valence shells you can see if a single atom is sharing two electrons from its valence shell).
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