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I n t
h e
1800s,
there w ere
two ways t
o o r
g ani
se the ele me nt
:
T he i
r Relat
ive at
o mic
Mass and their
physic al an d
chemi cal propert
ie s.


Th e
atomi c
str
u…

Page 2

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Dmitri Mendeleev

In 1 869,
D mitr
i
Me ndele ev
(i
n Russi a)
arr
a nge d hi
s t
abl
e of

el
e me nts
( 50
eleme nt
s)

H e pu t
t
he el
eme nts
in
o rder
of
atomi c
ma…

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