Tungsten 4+ ion magnetism? I just had a quiz and struggled on a particular question: 


  Tungsten forms a $+4$ ion. It is observed to be diamagnetic. The electron configuration for this ion may not be what you would expect. Write the electron configuration for tungsten(IV) that is diamagnetic.


So if tungsten has a configuration of $\ce{[Xe] 6s^1 4f^{14} 5d^5}$ and it loses 4 electrons wouldn't it be $\ce{[Xe] 6s^0 4f^1^4 5d^2}$? And this would be paramagnetic since there are 2 unpaired electrons in the 5d subshell. How could it be diamagnetic?
The electron configuration for Tungsten is [Xe] 6s2 5d4 4f14. If it were to lose its electrons, and the answer is that it is diamagnetic, then it would lose its 4 d-electrons.

References


https://www.quora.com/What-are-the-differences-between-paramagnetic-and-diamagnetic-elements
https://www.tabulka.cz/english/elements/configuration.asp?id=74
https://socratic.org/questions/what-are-columbic-and-exchange-energy-and-how-it-it-determined