In 1841 the discovery of a new chemical element, the metal didymium, was announced. It was and still is, used in some special safety glasses. It was not until 1885 that chemists discovered that didymium was a mixture of two different elements, which were named praseodymium and neodymium.
Why did it take so long for chemists to discover the mistake?
A. Praseodymium and neodymium were difficult to separate.
B. Didymium, praseodymium and neodymium are all metallic elements.
C. Safety glasses were so popular.
D. Didymium was magnetic but praseodymium and neodymium were non-magnetic.
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In 1841 the discovery of a new chemical element, the metal didymium, was announced. It was and still is, used in some special safety glasses. It was not until 1885 that chemists discovered that didymium was a mixture of two different elements, which were named praseodymium and neodymium.
A. Praseodymium and neodymium were difficult to separate.
B. Didymium, praseodymium and neodymium are all metallic elements.
C. Safety glasses were so popular.
D. Didymium was magnetic but praseodymium and neodymium were non-magnetic.
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