Which is correct - molybdate or molybdenate?

Most websites (including Wikipedia) say that the anion MoO42- is called a molybdate ion, although some websites use molybdenate instead. Which one is correct, and if one of them is correct, is the other term still allowed?




According to Table X of the Red Book (‘Nomenclature of Inorganic Chemistry – IUPAC recommendations 2005’), the anion name for molybdenum is **molybdate.**


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If you do a Google ngram of the terms 'molybdate' and 'molybdenate', you will find 'molybdate' standing out.


[![enter image description here](https://i.stack.imgur.com/mcvBz.png)](https://i.stack.imgur.com/mcvBz.png)


No one known why the 'en' was kept when you can simply shorten it to molybd-*ate* instead of molybden-*ate* (like phosph-ate and not phosphor-ate). However, the latter didn't got totally eliminated. Some research papers([here](https://www.researchgate.net/publication/292583045_Inhibitive_effects_of_molybdenate_on_iron_artifacts_during_desalination_process) is a recent example) and textbooks still uses 'molybdenate'. The following image is from a physics textbook published in 2020.


[![enter image description here](https://i.stack.imgur.com/BsEFp.png)](https://i.stack.imgur.com/BsEFp.png)


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