iform

s
elements are Knpn
by 876 8th crdier
elemens 40+137 every irCr0
tabyar Table many
are of Average 2
8- 8'SSr=
Knonn Prokrties height elements
I8 a So elemenks:
the
of d oPropertics
in by M fer
of in
properties
alnest Aomic the
Table. them Afyen
axongonent psital
to
third abhlable 1st in
Mof elements.
Ooiodie
Tablo Table
Univenso ane
aang
eual
triod
35-5+12?
Br: Br=80
8l2
= The the cleme
Periodic
thein and.that and
neavly Br' 2
Rule:tosimiarthe
Rule
Trjod
Dobere•ner
Doboreinen of nt
peredie to thoto 1o0
chamical first elements.
Wt 1W's octayeWas anora
Periodic is Ato
Ma
acording Hod
ds TnHnið Periodie of
elemants H39
=
Na
7+39 =23Atomic
ihhat
s Knoun PreSent.
Their
welght
7L Na
EX.
2 23
= Lintaten:
Newlelements
ond
Ihe In Na M= (He
S
of
M
 Ihert
gr
were Mendele
tine not
thal Known
(1-20)gas the Postan
on
the maye
Curve
Lothor
Inert
out. ceupy
Poston on
Posim
tor
Cs Ba destending
Lothor
Similar oniy of dropped properien
At
Distoyery ytoPiyad
PeGK ascending
by
Rb
vanCmlom
Li vaitd be
aYe simiar t the the
Atomic
oF to Oeeupy
eopy the la»as
Yule thehad Curve.
occuf) 1ncom
BCN o n
Atkr Lothar
MEyers
Curve:having Period'c
So This
ProPorties law the'
Na 0 Ba
and on Rb,(S
Sy,
O 0 Elements
Postion Ca, IBr, TheWas
s (Qw
Be a
Na :
Limitahion ABomic
Vo K, mg,
The Na, 4, on:
Li, Be, f, Limiai
0ie,
Li Na k
Ex:
 MENDELEEV'S Periodie laD (1869)
Profertes
Low The Phystal and chamtal funeton
of elemens aye the Periodic of
their atomic waghtt.
FeaHures
O 63 elements Were knoon lstouevd
That thne Noble gan fi2re not
Merdaleev' s Peiodic Table thene were
Ih SA
.Pevioddivided
and.into'
8gou4B subfoups
Each, Group Periodlcable
Merits /Adortoge of mendel eev's
the dl'stovery cf ned elemenß
ala enCUTGREmant to
as Some Aas were left in it
S Poshin
elemenfs tor whom
Ihase,Were the definsd by Merdeleel eyen
Ond PoPertles ere ool
beBore their disoyenies and he eft the bonk
SPaces tor them in hls table

EKa siliCon G
G EKa B0YOn Sc
0 Conoction of dobton Atomlc weghis
Be - 13-5 (Earier)
A ExV
b=4 S2 =9 [exa)
E =E Wt of Be 4Sother (onechm :U,In, AU,P!
V =val4ny = 2
Limigalon o Mendeleev's Periodlc hble
O poston of Hydrogen: Hydogen vesembl sboth
the alkal MekaJs (sr-14) ond ihe hogen (I4) in
noperies, 60 Merdelkev Coudn't decido whereto pPlacel

diferent,
in
They shoud haye poced fn diferot pastion
Periodic table. Bot theve were no Such ploces for
Isotope's in Mendelev's toble.
O Like elments were ploced in diyerent grujs:
PA and A hova sfmijar Properles buf bie
Placed fn diferent groups
VIl IB
Unle dlemens weYe Plated fn Same foup
I4 IB

Rb
(S

They have difeent inpsertes

Another exambe/ Co Te I
(S89 S36), \V22:5 12? )>
 0 Law:
ochti)ve Features (aste FeatyeS
CSRb TA 4-blocks brub
AlGeneral Fr K Na one in ln are
ting
e Melelements ’S-bloCK
2Gr-D4
4r-14 The prfodic
Modern
t Lap
oft is i's modern :Othe was
fled table Jnert Phystal
: Polnt S-block e Ba Sr Be LA S- Tn
periodic
of Te PertodicTable Modern poposed
Confgurahon inbloCK by
b) are
,k
Vey Yetalelemen}s
RomSay
gases tuncton
and,
Hgh s- Ramsygl
sUbshel.Qlemenks werepresent,
Periodic chemfta by
g e MOSeley
of
=ns ther
;element'sntrodbced Retentlyable Properties
Dn
ave atomic
hich ave gr
in Peziod 7
aen fertodlc tnbor
of
element cleshed
SONbe ord elemenks
 0 qeneral (s
(
FeaBures_ In B 4iled Rb K Na Li
Some loMP
w EN, Gy-13-18 to P- Give
Boron e inblock
TP, .0 PbSn 4e Si Blve vioiet
Red VioletGol
yelto den H1ame
Co|QUYfnve
elements Confguratio: p- Crimson
Red
EA 1n BI Sb Qlements
sUbshel.
Configuraio:ns'ap-6 fome
Metallofd
Present
are As P N
Vey þ-bloCK.
Pniegons,
sh High PoTe Se S : Test
ouo Tn RaBa Sr (a
Dmetal, Rn
At Kr
Br Chalcjhs Be
(ercept
yariable Ar
d hich
Xe Ne He
Non gn Crimson
Red. APple
Crimson
Gren Rad
(18)DrertHalejo eemenls BriRecKd flame
XColoun
Be,9)
oxidatm Metal
and 1oste
sfale
 Features:O AcLa Ti
Sc
V 3
Present
Gr-3 in en j- Hf C-blocK d-
5f 4f bik General
qy-
3t
12
atures e WfomColComblourdey OV TaNb
Used Show 4)
aYe wMo Cr 6
elements:
e
element Conhgrahnelements Fom
ane S-bolk ReTc Mnconkquralin
ave Vaytasable metal
simiar : Compex a os Ru Fe
))
biain lasteAlied
: KEN, catalyst od îr Rh Co last
to (n-2)f ompond Pt Pd N
: e
d as DP, state (n-)d
brock » EA finad
in Cu 6-2-10
Achi
(0-103)
Lantnidhe anlde n-Dd KP- (eraphn
Zn 12
t- ns ind
ekmenl black Miy 3 Subshell
obshel
ns2 2
At.no
SC
+2
42
(s8-) 29d