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Is KCl a heteronuclear diatomic molecule?

Below is the recommendation and reference answer for question "Is KCl a heteronuclear diatomic molecule?" It was collected and sorted by the editor of this site but not sure the answer is entirely accurate.

Yes.
KCl consists of two different ions, K+ and Cl-, so it is diatomic.
KCl is heteronuclear because the atoms (ions) are different and therefore have different atomic numbers and hence different nuclei. K+ has 19 protons while Cl- has 17 protons.

An example of a homonuclear diatomic molecule would be Cl2.