1s 1.0
H
1
4.0
He
2
2s 6.9
Li
3
9.0
Be
4
2p 10.8
B
5
12.0
C
6
14.0
N
7
16.0
O
8
19.0
F
9
20.2
Ne
10
3s 23.0
Na
11
24.3
Mg
12
3p 27.0
Al
13
28.1
Si
14
31.0
P
15
32.1
S
16
35.5
Cl
17
39.9
Ar
18
4s 39.1
K
19
40.1
Ca
20
3d 45.0
Sc
21
47.9
Ti
22
50.9
V
23
52.0
Cr
24
54.9
Mn
25
55.8
Fe
26
58.9
Co
27
58.7
Ni
28
63.5
Cu
29
65.4
Zn
30
4p 69.7
Ga
31
72.6
Ge
32
74.9
As
33
79.0
Se
34
79.9
Br
35
83.8
Kr
36
5s 85.5
Rb
37
87.6
Sr
38
4d 88.9
Y
39
91.2
Zr
40
92.9
Nb
41
95.9
Mo
42
(99)
Tc
43
101.1
Ru
44
102.9
Rh
45
106.4
Pd
46
107.9
Ag
47
112.4
Cd
48
5p 114.8
In
49
118.7
Sn
50
121.8
Sb
51
127.6
Te
52
126.9
I
53
131.3
Xe
54
6s 132.9
Cs
55
137.3
Ba
56
5d 138.9
La
57
* 178.5
Hf
72
181.0
Ta
73
183.9
W
74
186.2
Re
75
190.2
Os
76
192.2
Ir
77
195.1
Pt
78
197.0
Au
79
200.6
Hg
80
6p 204.4
Tl
81
207.2
Pb
82
209.0
Bi
83
(210)
Po
84
(210)
At
85
(222)
Rn
86
7s (223)
Fr
87
(226)
Ra
88
6d (227)
Ac
89
! (261)
Rf
104
(262)
Db
105
(263)
Sg
106
(262)
Bh
107
(265)
Hs
108
(266)
Mt
109
Mean atomic mass
Element
Atomic number
*
Lanthanides
140.1
Ce
58
140.9
Pr
59
144.2
Nd
60
(147)
Pm
61
150.4
Sm
62
152.0
Eu
63
157.3
Gd
64
158.9
Tb
65
162.5
Dy
66
164.9
Ho
67
167.3
Er
68
168.9
Tm
69
173.0
Yb
70
175.0
Lu
71
s
block
d
block
p
block
f
block
!
Actinides 
232.0
Th
90
(231)
Pa
91
238.1
U
92
(237)
Np
93
(244)
Pu
94
(243)
Am
95
(247)
Cm
96
(247)
Bk
97
(251)
Cf
98
(252)
Es
99
(257)
Fm
100
(258)
Md
101
(259)
No
102
(260)
Lr
103
basic advanced uses discovery oxidising oxides chlorine chlorides
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Density
 
Melting
Point
Boiling
Point
Discovery
Date
1st ionisation
energy
Enthalpy of
fusion
Enthalpy of
Vaporisation
Electrical
Resistivity
Thermal
Conductivity
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Commonest natural isotope:
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Atomic number, Z:
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