??? : Periodic table (discovery periods, compact)

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v t e Timeline of chemical elements discoveries
H																															He
Li	Be																									B	C	N	O	F	Ne
Na	Mg																									Al	Si	P	S	Cl	Ar
K	Ca															Sc	Ti	V	Cr	Mn	Fe	Co	Ni	Cu	Zn	Ga	Ge	As	Se	Br	Kr
Rb	Sr															Y	Zr	Nb	Mo	Tc	Ru	Rh	Pd	Ag	Cd	In	Sn	Sb	Te	I	Xe
Cs	Ba	La	Ce	Pr	Nd	Pm	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	Hf	Ta	W	Re	Os	Ir	Pt	Au	Hg	Tl	Pb	Bi	Po	At	Rn
Fr	Ra	Ac	Th	Pa	U	Np	Pu	Am	Cm	Bk	Cf	Es	Fm	Md	No	Lr	Rf	Db	Sg	Bh	Hs	Mt	Ds	Rg	Cn	Uut	Fl	Uup	Lv	Uus	Uuo
Legend Antiquity to Middle Ages (14 elements): unrecorded discoveries up until the Middle Ages Middle Ages – 1800 (+20 elements): discoveries during the age of enlightenment 1800–1849 (+24 elements): science and industrial revolutions 1850–1899 (+26 elements): the age of classifying elements received the impulse of the spectral analysis Boisbaudran, Bunsen, Crookes, Kirchhoff, and others "hunting emission line signatures" 1900–1949 (+13 elements): impulse with the old quantum theory and quantum mechanics 1950–1999 (+16 elements): "post atomic bomb" issues for atomic numbers 98 and above (colliders, bombardment techniques) 2000–present (+5 elements): recent synthesis

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