Periodic Table Elements and Symbol
Atomic No
|
Chemical Element Name
|
Symbol
|
Discovery
(Year)
|
Group
|
Atomic Mass
|
1
|
H
|
1776
|
1
|
1.0079
|
|
2
|
He
|
1895
|
18
|
4.0026
|
|
3
|
Li
|
1817
|
1
|
6.941
|
|
4
|
Be
|
1797
|
2
|
9.0122
|
|
5
|
B
|
1808
|
13
|
10.811
|
|
6
|
C
|
Ancient
|
14
|
12.0107
|
|
7
|
N
|
1772
|
15
|
14.0067
|
|
8
|
O
|
1774
|
16
|
15.9994
|
|
9
|
F
|
1886
|
17
|
18.9984
|
|
10
|
Ne
|
1898
|
18
|
20.1797
|
|
11
|
Na
|
1807
|
1
|
22.9897
|
|
12
|
Mg
|
1755
|
2
|
24.305
|
|
13
|
Al
|
1825
|
13
|
26.9815
|
|
14
|
Si
|
1824
|
14
|
28.0855
|
|
15
|
P
|
1669
|
15
|
30.9738
|
|
16
|
S
|
Ancient
|
16
|
32.065
|
|
17
|
Cl
|
1774
|
17
|
35.453
|
|
18
|
Ar
|
1894
|
18
|
39.948
|
|
19
|
K
|
1807
|
1
|
39.0983
|
|
20
|
Ca
|
1808
|
2
|
40.078
|
|
21
|
Sc
|
1879
|
3
|
44.9559
|
|
22
|
Ti
|
1791
|
4
|
47.867
|
|
23
|
V
|
1830
|
5
|
50.9415
|
|
24
|
Cr
|
1797
|
6
|
51.9961
|
|
25
|
Mn
|
1774
|
7
|
54.938
|
|
26
|
Fe
|
Ancient
|
8
|
55.845
|
|
27
|
Co
|
1735
|
9
|
58.9332
|
|
28
|
Ni
|
1751
|
10
|
58.6934
|
|
29
|
Cu
|
Ancient
|
11
|
63.546
|
|
30
|
Zn
|
Ancient
|
12
|
65.39
|
|
31
|
Ga
|
1875
|
13
|
69.723
|
|
32
|
Ge
|
1886
|
14
|
72.64
|
|
33
|
As
|
Ancient
|
15
|
74.9216
|
|
34
|
Se
|
1817
|
16
|
78.96
|
|
35
|
Br
|
1826
|
17
|
79.904
|
|
36
|
Kr
|
1898
|
18
|
83.8
|
|
37
|
Rb
|
1861
|
1
|
85.4678
|
|
38
|
Sr
|
1790
|
2
|
87.62
|
|
39
|
Y
|
1794
|
3
|
88.9059
|
|
40
|
Zr
|
1789
|
4
|
91.224
|
|
41
|
Nb
|
1801
|
5
|
92.9064
|
|
42
|
Mo
|
1781
|
6
|
95.94
|
|
43
|
Tc
|
1937
|
7
|
98
|
|
44
|
Ru
|
1844
|
8
|
101.07
|
|
45
|
Rh
|
1803
|
9
|
102.9055
|
|
46
|
Pd
|
1803
|
10
|
106.42
|
|
47
|
Ag
|
Ancient
|
11
|
107.8682
|
|
48
|
Cd
|
1817
|
12
|
112.411
|
|
49
|
In
|
1863
|
13
|
114.818
|
|
50
|
Sn
|
Ancient
|
14
|
118.71
|
|
51
|
Sb
|
Ancient
|
15
|
121.76
|
|
52
|
Te
|
1783
|
16
|
127.6
|
|
53
|
In
|
1811
|
17
|
126.9045
|
|
54
|
Xe
|
1898
|
18
|
131.293
|
|
55
|
Cs
|
1860
|
1
|
132.9055
|
|
56
|
Ba
|
1808
|
2
|
137.327
|
|
57
|
La
|
1839
|
3
|
138.9055
|
|
58
|
Ce
|
1803
|
101
|
140.116
|
|
59
|
Pr
|
1885
|
101
|
140.9077
|
|
60
|
Nd
|
1885
|
101
|
144.24
|
|
61
|
Pm
|
1945
|
101
|
145
|
|
62
|
Sm
|
1879
|
101
|
150.36
|
|
63
|
Eu
|
1901
|
101
|
151.964
|
|
64
|
Gd
|
1880
|
101
|
157.25
|
|
65
|
Tb
|
1843
|
101
|
158.9253
|
|
66
|
Dy
|
1886
|
101
|
162.5
|
|
67
|
Ho
|
1867
|
101
|
164.9303
|
|
68
|
Er
|
1842
|
101
|
167.259
|
|
69
|
Tm
|
1879
|
101
|
168.9342
|
|
70
|
Yb
|
1878
|
101
|
173.04
|
|
71
|
Lu
|
1907
|
101
|
174.967
|
|
72
|
Hf
|
1923
|
4
|
178.49
|
|
73
|
Ta
|
1802
|
5
|
180.9479
|
|
74
|
W
|
1783
|
6
|
183.84
|
|
75
|
Re
|
1925
|
7
|
186.207
|
|
76
|
Os
|
1803
|
8
|
190.23
|
|
78
|
Pt
|
1803
|
9
|
192.217
|
|
79
|
Au
|
1735
|
10
|
195.078
|
|
77
|
Ir
|
Ancient
|
11
|
196.9665
|
|
80
|
Hg
|
Ancient
|
12
|
200.59
|
|
81
|
Tl
|
1861
|
13
|
204.3833
|
|
82
|
Pb
|
Ancient
|
14
|
207.2
|
|
83
|
Bi
|
Ancient
|
15
|
208.9804
|
|
84
|
Po
|
1898
|
16
|
209
|
|
85
|
At
|
1940
|
17
|
210
|
|
86
|
Rn
|
1900
|
18
|
222
|
|
87
|
Fr
|
1939
|
1
|
223
|
|
88
|
Ra
|
1898
|
2
|
226
|
|
89
|
Ac
|
1899
|
3
|
227
|
|
90
|
Th
|
1829
|
102
|
232.0381
|
|
91
|
Pa
|
1913
|
102
|
231.0359
|
|
92
|
U
|
1789
|
102
|
238.0289
|
|
93
|
Np
|
1940
|
102
|
237
|
|
94
|
Pu
|
1940
|
102
|
244
|
|
95
|
Am
|
1944
|
102
|
243
|
|
96
|
Cm
|
1944
|
102
|
247
|
|
97
|
Bk
|
1949
|
102
|
247
|
|
98
|
Cf
|
1950
|
102
|
251
|
|
99
|
Es
|
1952
|
102
|
252
|
|
100
|
Fm
|
1952
|
102
|
257
|
|
101
|
Md
|
1955
|
102
|
258
|
|
102
|
No
|
1958
|
102
|
259
|
|
103
|
Lr
|
1961
|
102
|
262
|
|
104
|
Rf
|
1964
|
4
|
261
|
|
105
|
Db
|
1967
|
5
|
262
|
|
106
|
Sg
|
1974
|
6
|
266
|
|
107
|
Bh
|
1981
|
7
|
264
|
|
108
|
Hs
|
1984
|
8
|
277
|
|
109
|
Mt
|
1982
|
9
|
268
|
|
110
|
Ds
|
1994
|
10
|
261.9
|
|
111
|
Rg
|
1994
|
11
|
271.8
|
|
112
|
Cn
|
1996
|
12
|
285
|
|
113
|
Uut
|
2003
|
13
|
286
|
|
114
|
Fl
|
1998
|
14
|
289
|
|
115
|
Uup
|
2010
|
15
|
288
|
|
116
|
Lv
|
2000
|
16
|
293
|
|
117
|
Uus
|
2010
|
17
|
260.9
|
|
118
|
Uuo
|
2006
|
18
|
294
|
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