How do you name #"Nd"_2"Fe"_(14)"B"#?
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Neodymium-Ferro-Boron, otherwise known as an NdFeB magnet, constructed as an alloy of primarily neodymium, iron, and boron.
It's a rare-earth magnet compound.
#"Nd"#is the chemical symbol for neodymium. #"Fe"#can be called by its old prefix, "ferro", though saying "iron" is fair game. #"B"#is still called boron.
This website states the name in full for these kinds of magnets.