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 THE

PERIODIC

 TABLE

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•  The Periodic Table is an arrangement of thechemical elements arrange in orer of atomicn!m"er# !s!all$ in ro%s# so that elements %ith similaratomic str!ct!re &an hence similar chemical'ro'erties( a''ear in )ertical col!mns*

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440 BC• Democritus an Leucippus 'ro'ose the iea of the

atom# an ini)isi"le 'article that all matter is mae of*

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330 BC• Aristotle 'ro'ose the fo!r element theor$+ earth# air#

,re - %ater*

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1605• Sir Francis Bacon '!"lishe .The Pro,cience an

A)ancement of Learning. %hich containe aescri'tion of %hat %o!l later "e /no%n as TheScientic !ethod"

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1661• #obert Bo$le '!"lishe .The 0ce'tical Ch$mist.

%hich %as a treatise on the istinction"et%een chemistr$ an alchem$* It also containesome of the earliest ieas of atoms# molec!les# anchemical reaction mar/ing the "eginning of the histor$of moern chemistr$*

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1%54•  &oseph Blac' isolate car"on io1ie# %hich he calle

.,1e air2*

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1%66• (enr$ Ca)endish isco)ere h$rogen as a

colorless# oorless gas that "!rns an can form ane1'losi)e mi1t!re %ith air*

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1%%3,1%%4• Carl -ilhelm Scheele an &oseph Priestle$ 

ine'enentl$ isolate o1$gen*

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1*03•  &ohn Dalton 'ro'ose .Dalton5s La%. escri"ing the

relationshi' "et%een the com'onents in a mi1t!re ofgases*

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1*.*•  &a'ob Ber/elius e)elo'e a ta"le of atomic %eights

- intro!ce letters to s$m"oli6e elements*

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1*.*•  &ohann Dobereiner e)elo'e gro!'s of 3 elements

%ith similar 'ro'erties*

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1*64•  &ohn elands arrange the /no%n elements in

orer of atomic %eights - o"ser)e similarities"et%een some elements*

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1*64• Lothar !e$er e)elo's an earl$ )ersion of the

'erioic ta"le# %ith 78 elements organi6e "$ )alence*

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1*24• -illiam #amsa$ isco)ere the No"le :ases*

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1*2*• !arie and Pierre Curie isolate rai!m an

'oloni!m from 'itch"lene*

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1200• rnest #utherord isco)ere the so!rce of

raioacti)it$ as eca$ing atoms*

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1213• (enr$ !osele$ etermine the atomic n!m"er of

each of the elements an moi,e the 5Perioic La%5*

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1240• din !c!illan and Philip (" +belson ientif$

ne't!ni!m# the lightest an ,rst s$nthesi6etrans!rani!m elements# fo!n in the 'ro!cts of

!rani!m ,ssion*

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1240• lenn Seabor s$nthesi6e trans!ranic elements

&the elements after !rani!m in the 'erioic ta"le(*

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