Statistics for Original Elements of the Periodic Table Quiz - Hard

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Year Discovered	Symbol	Element	% Correct
Ancient Times - Prior to 1 A.D.	Au	Gold	100%
Ancient Times - Prior to 1 A.D.	Cu	Copper	90%
Ancient Times - Prior to 1 A.D.	Ag	Silver	90%
Ancient Times - Prior to 1 A.D.	C	Carbon	80%
1766	H	Hydrogen	80%
Ancient Times - Prior to 1 A.D.	Fe	Iron	80%
1751	Ni	Nickel	80%
1774	O	Oxygen	80%
1746	Zn	Zinc	80%
1825	Al	Aluminium	70%
1808	Ba	Barium	70%
1797	Be	Beryllium	70%
1817	Cd	Cadmium	70%
1808	Ca	Calcium	70%
1860	Cs	Cesium	70%
1774	Cl	Chlorine	70%
1803	Ir	Iridium	70%
Ancient Times - Prior to 1 A.D.	Pb	Lead	70%
1817	Li	Lithium	70%
1755	Mg	Magnesium	70%
1774	Mn	Manganese	70%
1772	N	Nitrogen	70%
1735	Pt	Platinum	70%
1807	K	Potassium	70%
1817	Se	Selenium	70%
1807	Na	Sodium	70%
Ancient Times - Prior to 1 A.D.	S	Sulfur	70%
Ancient Times - Prior to 1 A.D.	Sn	Tin	70%
1791	Ti	Titanium	70%
1789	U	Uranium	70%
1801	V	Vanadium	70%
1250	As	Arsenic	60%
1753	Bi	Bismuth	60%
1808	B	Boron	60%
1826	Br	Bromine	60%
1797	Cr	Chromium	60%
1735	Co	Cobalt	60%
1863	In	Indium	60%
1811	I	Iodine	60%
Ancient Times - Prior to 1 A.D.	Hg	Mercury	60%
1801	Nb	Niobium	60%
1803	Os	Osmium	60%
1669	P	Phosphorus	60%
1803	Rh	Rhodium	60%
1861	Rb	Rubidium	60%
1861	Tl	Thallium	60%
1783	W	Tungsten	60%
1600	Sb	Antimony	50%
1803	Ce	Cerium	50%
1843	Er	Erbium	50%
1778	Mo	Molybdenum	50%
1803	Pd	Palladium	50%
1844	Ru	Ruthenium	50%
1824	Si	Silicon	50%
1782	Te	Tellurium	50%
1794	Y	Yttrium	50%
1789	Zr	Zirconium	50%
1839	La	Lanthanum	40%
1790	Sr	Strontium	40%
1802	Ta	Tantalum	40%
1843	Tb	Terbium	40%
1828	Th	Thorium	40%