![](3D"lewis_files/image002.jpg")
Gilbert
Newton Lewis
=
(1875
– 1946)
Gilbert Lewis ble født i Massachusetts i USA
23.oktober 1875. Han begynte på universitetet i Nebraska da han var 14
år, men flyttet over til Harvard tre år seinere. Han tok
doktorgraden i kjemi i 1899, og arbeidet videre med fysikalsk kjemi i flere
år. I 1911 ble han professor i fysikalsk kjemi ved Berkeley College of
Chemistry ved universitetet i California, der han ble helt til han dø=
;de.
Lewis hadde et bredt interessefelt. Forskningen hans d=
reide
seg om termodynamikk og kjemisk likevekt, isotoper i kjemien, spesielt tungt
hydrogen (deuterium), og ikke minst kovalent binding mellom atomer. Lewis v=
ar
den første som beskrev den kovalente bindingen som et eller flere
elektronpar som blir delt mellom atomer i el molekyl. Lewis brukte selv nep=
pe
ordet ”oktett”, men oktettregelen blir likevel ofte knyttet til
han. Begrepet ”Lewisstrukturer” for molekyler og sammensatte io=
ner
er velkjent. Disse er grunnlaget for å bestemme den romlige strukturen
til stoffer.
Lewis utvidet syre-basebegrepene som var innfør=
t av
Johannes Brønsted. En syre er etter Lewis definisjoner en
elektronparmottaker, mens en base er en elektronpargiver. Disse definisjone=
ne
forklarer hvorfor molekyler som for eksempel BF3 har sterkt sure
egenskaper.
Han beregnet verdier på fysikalske større=
lser
som elektrodepotensialer, ledningsevne og standard fri energi for mange
stoffer. Tabellene hans er fremdeles i bruk.
Lewis døde i laboratoriet sitt på Berkeley
23.mars 1946.
Lewis’ definisjoner på syrer og baser: En =
syre
er en elektronparmottaker.
=
&nb=
sp; =
&nb=
sp; =
En base er en elektronpargiver.
Lewisstruktur: Et molekyl eller ion tegnet opp med
elektronene fordelt rundt.
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