Statistics for Name a Valid Chemical Element

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Name an element that ...	Answer	% Correct
.. is a gas	Hydrogen, Helium, Oxygen, ...	100%
..is a liquid	Bromine, Mercury	92%
..is yellow	Sulphur, Gold, Fluorine, (Caesium, Chlorine)	92%
..does not end in "-ium", "-ine", "-en", or "-on"	Gold, Silver, Lead, Antimony ...	90%
..is named after an object in the solar system	Helium, Cerium, Uranium, ...	90%
..contains the letter X	Oxygen, Xenon	87%
..is found in charcoal, diamonds, and lima beans	Carbon	84%
..is named after a country	Copper, Germanium, Nihonium, ...	73%
..is named after a woman (real or mythological)	Meitnerium, Curium; Vanadium, Selenium, Niobium	67%
..is named after a city	Yttrium, Holmium, Berkelium, ...	55%
..has an extra "i" in Britain, but not in the U.S.	Alumin(i)um	54%
..was named in the 21st century	Darmstadtium, Roentgenium, ...	46%
..occurs naturally AND was discovered in the 20th century	Actinium, Lutetium, Rhenium, ...	39%
..is a "rare earth"	Cerium, Neodymium, Praseodymium, ...	21%
..makes red fireworks	Lithium, Strontium	20%
..was discovered during the Manhattan Project	Americium, Curium	13%
..was once named Kurchatovium (Ku)	Rutherfordium	7%