I need to write around $ceCuCl2$, and found in Wikipedia that if girlfriend subtract electronegativity you obtain what bond the is:
$$chi (ceCl) = 3.16, quad chi (ceCu) = 1.90$$
$$chi = 3.16 - 1.90 = 1.26$$
$chi 1.7 Rightarrow$ ionic
So it need to be really a covalent bond. I beg your pardon one is correct?
You must be cautious with an easy associations such as "metal + non-metal = ionic bond". These often tend to throw the end the idea of knowledge the smashville247.net affiliated in favour of rote memorization. Note for instance that mixing caesium metal with yellow will develop a salt rather of one alloy, caesium auride ($ceCs^+ Au^-$). Mixing barium metal and also platinum can additionally produce salts, though your structures are somewhat an ext complex. One can additionally argue that there is far-reaching ionic character in hard xenon difluoride, also though both atoms space non-metals.
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The idea of utilizing electronegativity to identify covalent/ionic character is likewise meant together a beneficial guide, no as a strict dominance with black-and-white limits. Firstly, every bonds have both ionic and covalent character; both ideas are an oversimplification, and in reality it is more correct come say the a bond has actually a certain contribution native each form of bonding. This way there is a smooth transition from compound with mostly ionic character and those with mainly covalent character. Also, the inequalities you mention rely on Pauling electronegativities. Electronegativity is surprisingly still a hotly questioned topic, as we continue to search more general, more fundamental and more precise means of defining it. Pauling electronegativities are based upon empirical thermodynamic data about bond energies after using a particular equation the was "picked", not derived from scratch. The values are specifically poorly defined for transition elements, such together the $ceCu$ in her problem. You acquire some not-so-easy to define situations, like $ceHF$ as a gas that is a borderline ionic compound.
Finally, in irradiate of this comments, the answer come your question is the bonding in $ceCuCl_2$ (I"m pretty sure that"s what girlfriend actually meant to write) has actually intermediate characteristics between a completely ionic and a polar covalent bond, with comparable contributions (though pinpointing i beg your pardon is highest possible sounds favor an exercise in futility). A an excellent way to examine it an ext in depth is to analyze Fajans" rules. ~ a little self-calibration, girlfriend can gain a good feel for the degree of ionicity and also covalency the a compound.
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Part further yet less certain evidence (lots that caveats!) for the intermediate personality of $ceCuCl_2$ deserve to be found by looking at the substances" melting and boiling clues ($pu498°C$ and $pu993°C$