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Firms are exploring sodium batteries as an alternative to lithium
(www.economist.com)
This is a most excellent place for technology news and articles.
Most likely because the news is in English. And why would Natrium be better on an international forum?
It is Sodium in most Latin languages (despite Natrium being Latin), in Hindi and in Arabic. And Chinese has a different root. Among the 10 most spoken languages (according to Wikipedia), only Russian is using Natrium.
As a native English speaker, I don't think I've ever heard someone call NaCl just "Sodium", it's always called "Sodium Chloride".
That's interesting, it looks like I may have a bias on that due to my scientific background.