POST CLASS NOTES
Periodic Classification
of Elements
Topics
1. Various Attempts in
the Classification of Elements
ӧ
ӧ
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’
2. Modern Periodic
Table
Alkali metals
Non-metals
Alkaline earth metals
Halogens
Transition elements
Noble gases
Other metals
Lanthanides
Metalloids
Actinides
1
H
3
Li
4
Be
11
Mg
Na
55
Cs
22
Ti
72
57-71
Hf
89-103
Rf
73
Ce
6
5
C
B
Th
106
60
92
U
76
107
108
Hs
46
77
lr
109
110
Ds
62
63
64
Eu
Gd
95
96
93
Np
94
Pu
48
79
Tl
112
Cn
65
Tb
66
98
Cf
82
114
113
67
Ho Er
Es
99
115
Mc
Fl
68
100
69
Tm
101
Xe
84
Po
85
At
116
Lv
70
102
Fm Md No
86
Rn
117
Ts
Yb
54
53
l
83
36
Kr
52
Te
Bi
35
Br
51
Sb
Pb
Nh
Dy
97
Am Cm Bk
81
80
Hg
111
Rg
Sn
18
Ar
34
Se
50
49
ln
17
Cl
33
As
10
Ne
16
S
32
Ge
F
15
P
31
Ga
Cd
Au
Pm Sm
61
47
Ag
78
Pt
Mt
Zn
O
14
9
8
7
N
Si
30
29
Cu
Pd
Rh
Os
Bh
Nd
91
Pa
75
Re
Ni
45
44
Ru
28
27
Co
43
74
Sg
26
Fe
Tc
W
59
Pr
90
89
Ac
105
Db
58
57
La
42
Mo
Ta
104
88
Mn
41
Nb
25
24
Cr
40
Zr
56
Ra
23
V
39
Y
Ba
87
Fr
21
Sc
Sr
2
13
38
37
Rb
Atomic Symbol
He
Al
Ca
Atomic number
Pt
12
20
19
K
78
71
Lu
103
Lr
118
Og
3. Trends in Modern
Periodic Table
–
Mind Map
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