Q 01/05
A) 82
B) 92
C) 94
D) 88
Answer · why
Its symbol is U and it sits in the actinide series; it is the highest-numbered element found naturally in significant amounts.
Q 02/05
A) Neptune
B) Saturn
C) Uranus
D) Pluto
Answer · why
William Herschel had discovered the planet only eight years before the element was found in 1789.
Q 03/05
A) Justus von Liebig
B) Robert Bunsen
C) Friedrich Wöhler
D) Martin Heinrich Klaproth
Answer · why
He precipitated a yellow compound from the ore and thought the black powder he then made was the metal; it was actually an oxide.
Q 04/05
A) Bauxite
B) Pitchblende
C) Galena
D) Cinnabar
Answer · why
Pitchblende is uraninite, uranium's natural oxide, and remains the most common uranium ore.
Q 05/05
A) Henri Moissan
B) Eugène-Melchior Péligot
C) Joseph Gay-Lussac
D) Louis Pasteur
Answer · why
He was professor of analytical chemistry at the Conservatoire National des Arts et Métiers in Paris.
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