Which element is commonly used in catalytic converters due to its properties as a reducing agent?
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- Intermediate Intermediate difficulty.
- Chemistry
Which element did Marie and Pierre Curie discover in 1898 and name after Poland?
Answer
Polonium
- Hard Hard difficulty.
- Chemistry
Which element, first synthesized in 2010, has atomic number 117?
Answer
Tennessine
- Hard Hard difficulty.
- Chemistry
Which 1913 law relates the frequency of X-ray lines to the atomic number of elements?
Answer
Moseley's law
- Intermediate Intermediate difficulty.
- Chemistry
Who formulated the law of definite proportions around 1794?
Answer
Joseph Proust