History of The Periodic Table - Main Discovery Periods

Main Discovery Periods

The history of the periodic table is also a history of the discovery of the chemical elements. IUPAC suggests five "main discovery periods", and a sixth has been added here for very recently synthesised elements (discovered 2000 or later).

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 recived 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

Read more about this topic:  History Of The Periodic Table

Famous quotes containing the words periods, main and/or discovery:

    It has no future but itself—
    Its infinite contain
    Its past—enlightened to perceive
    New periods of pain.
    Emily Dickinson (1830–1886)

    It is indeed very possible, that the Persons we laugh at may in the main of their Characters be much wiser Men than our selves; but if they would have us laugh at them, they must fall short of us in those Respects which stir up this Passion.
    Joseph Addison (1672–1719)

    He is not a true man of science who does not bring some sympathy to his studies, and expect to learn something by behavior as well as by application. It is childish to rest in the discovery of mere coincidences, or of partial and extraneous laws. The study of geometry is a petty and idle exercise of the mind, if it is applied to no larger system than the starry one.
    Henry David Thoreau (1817–1862)