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
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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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Boiling Point (K):
Atomic number, Z:
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