Chemical Elements.com - Discovery Date

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	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
1	H																	He
1	1766																	1895
2	Li	Be											B	C	N	O	F	Ne
2	1817	1798											1808	*	1772	1774	1886	1898
3	Na	Mg											Al	Si	P	S	Cl	Ar
3	1807	1808											1825	1823	1669	*	1774	1894
4	K	Ca	Sc	Ti	V	Cr	Mn	Fe	Co	Ni	Cu	Zn	Ga	Ge	As	Se	Br	Kr
4	1807	1808	1879	1791	1830	1797	1774	*	1737	1751	*	1746	1875	1886	*	1817	1826	1898
5	Rb	Sr	Y	Zr	Nb	Mo	Tc	Ru	Rh	Pd	Ag	Cd	In	Sn	Sb	Te	I	Xe
5	1861	1790	1794	1789	1801	1778	1937	1844	1803	1803	*	1817	1863	*	*	1782	1804	1898
6	Cs	Ba	*	Hf	Ta	W	Re	Os	Ir	Pt	Au	Hg	Tl	Pb	Bi	Po	At	Rn
6	1860	1808		1923	1802	1783	1925	1804	1804	1735	*	*	1861	*	*	1898	1940	1898
7	Fr	Ra	**	Rf	Db	Sg	Bh	Hs	Mt	Uun	Uuu	Uub
7	1939	1898		1969	1970	1974	1976	Disputed	1982	1987	1994	1996

			*	La	Ce	Pr	Nd	Pm	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu
				1839	1803	1885	1925	1945	1879	1901	1880	1843	1886	1878	1843	1879	1878	1907
			**	Ac	Th	Pa	U	Np	Pu	Am	Cm	Bk	Cf	Es	Fm	Md	No	Lr
				1899	1828	1917	1789	1940	1940	1945	1944	1949	1950	1952	1953	1955	1957	1961

* Known to ancient civilizations

Element Groups (Families)
Alkali Earth	Alkaline Earth	Transition Metals
Rare Earth	Other Metals	Metalloids
Non-Metals	Halogens	Noble Gases