I have to write about $ceCuCl2$, and found in Wikipedia the if friend subtract electronegativity you get what bond that is:
$$chi (ceCl) = 3.16, quad chi (ceCu) = 1.90$$
$$chi = 3.16 - 1.90 = 1.26$$
$chi 1.7 Rightarrow$ ionic
So it must be yes, really a covalent bond. I m sorry one is correct?
You should be careful with simple associations such together "metal + non-metal = ionic bond". These tend to throw out the idea of knowledge the betterworld2016.org connected in favour that rote memorization. Keep in mind for example that mixing caesium steel with yellow will create a salt instead of an alloy, caesium auride ($ceCs^+ Au^-$). Mixing barium metal and also platinum can also produce salts, though your structures room somewhat an ext complex. One can also argue the there is far-ranging ionic character in hard xenon difluoride, even though both atoms room non-metals.
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The idea of using electronegativity to identify covalent/ionic character is additionally meant together a valuable guide, not as a strict dominance with black-and-white limits. Firstly, every bonds have actually both ionic and covalent character; both concepts are an oversimplification, and also in truth it is more correct come say that a bond has actually a details contribution from each type of bonding. This method there is a smooth transition from link with mostly ionic character and also those with mainly covalent character. Also, the inequalities you cite rely ~ above Pauling electronegativities. Electronegativity is surprisingly still a hotly debated topic, as we proceed to search much more general, more basic and an ext precise ways of defining it. Pauling electronegativities are based upon empirical thermodynamic data concerning bond energies after applying a details equation the was "picked", not derived from scratch. The values are an especially poorly identified for transition elements, such as the $ceCu$ in her problem. You acquire some not-so-easy to describe situations, favor $ceHF$ as a gas that is a borderline ionic compound.
Finally, in irradiate of these comments, the answer to your inquiry is the bonding in $ceCuCl_2$ (I"m pretty certain that"s what girlfriend actually expected to write) has actually intermediate characteristics in between a purely ionic and a polar covalent bond, with comparable contributions (though pinpointing which is highest sounds favor an exercise in futility). A good way to research it much more in depth is to analyze Fajans" rules. After ~ a small self-calibration, you can get a great feel for the degree of ionicity and covalency that a compound.
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Some further however less details evidence (lots that caveats!) for the intermediate character of $ceCuCl_2$ deserve to be found by looking at the substances" melting and boiling point out ($pu498°C$ and also $pu993°C$