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Atomic Numbers Weights Melting Temperatures
Engineering Metals and Materials
Atomic Elements Symbols, Atomic Numbers, Weights and Melting Temperature point
|
Element
|
Symbol
|
Atomic
|
Melting
Point, °C |
|
|
Num.
|
Weight
|
|||
|
Actinium
|
Ac
|
89
|
227.028
|
1050
|
|
Aluminum
|
Al
|
13
|
26.9815
|
660.37
|
|
Americium
|
Am
|
95
|
(243)
|
994 ± 4
|
|
Antimony
|
Sb
|
51
|
121.75
|
630.74
|
|
Argon
|
A
|
18
|
39.948
|
−189.2
|
|
Arsenic
|
As
|
33
|
74.9216
|
8171
|
|
Astatine
|
At
|
85
|
(210)
|
302
|
|
Barium
|
Ba
|
56
|
137.33
|
725
|
|
Berkelium
|
Bk
|
97
|
(247)
|
…
|
|---|---|---|---|---|
|
Beryllium
|
Be
|
4
|
9.01218
|
1278 ± 5
|
|
Bismuth
|
Bi
|
83
|
208.980
|
271.3
|
|
Boron
|
B
|
5
|
10.81
|
2079
|
|
Bromine
|
Br
|
35
|
79.904
|
−7.2
|
|
Cadmium
|
Cd
|
48
|
112.41
|
320.9
|
|
Calcium
|
Ca
|
20
|
40.08
|
839 ± 2
|
|
Californium
|
Cf
|
98
|
(251)
|
…
|
|
Carbon
|
C
|
6
|
12.011
|
36523
|
|
Cerium
|
Ce
|
58
|
140.12
|
798 ± 2
|
|
Cesium
|
Cs
|
55
|
132.9054
|
28.4 ± 0.01
|
|
Chlorine
|
Cl
|
17
|
35.453
|
−100.98
|
|
Chromium
|
Cr
|
24
|
51.996
|
1857 ± 20
|
|
Cobalt
|
Co
|
27
|
58.9332
|
1495
|
|
Copper
|
Cu
|
29
|
63.546
|
1083.4 ± 0.2
|
|
Curium
|
Cm
|
96
|
(247)
|
1340 ± 40
|
|
Dysprosium
|
Dy
|
66
|
162.5
|
1409
|
|
Einsteinium
|
Es
|
99
|
(252)
|
…
|
|
Erbium
|
Er
|
68
|
167.26
|
1522
|
|
Europium
|
Eu
|
63
|
151.96
|
822 ± 5
|
|
Fermium
|
Fm
|
100
|
(257)
|
…
|
|
Fluorine
|
F
|
9
|
18.9984
|
−219.62
|
|
Francium
|
Fr
|
87
|
(223)
|
|
|
Gadolinium
|
Gd
|
64
|
157.25
|
1311 ± 1
|
|
Gallium
|
Ga
|
31
|
69.72
|
29.78
|
|
Germanium
|
Ge
|
32
|
72.59
|
937.4
|
|
Gold
|
Au
|
79
|
196.967
|
1064.434
|
|
Hafnium
|
Hf
|
72
|
178.49
|
2227 ± 20
|
|
Helium
|
He
|
2
|
4.00260
|
−272.24
|
|
Holmium
|
Ho
|
67
|
164.930
|
1470
|
|
Hydrogen
|
H
|
1
|
1.00794
|
−259.14
|
|
Indium
|
In
|
49
|
114.82
|
156.61
|
|
Iodine
|
I
|
53
|
126.905
|
113.5
|
|
Iridium
|
Ir
|
77
|
192.22
|
2410
|
|
Iron
|
Fe
|
26
|
55.847
|
1535
|
|
Krypton
|
Kr
|
36
|
83.80
|
−156.6
|
|
Lanthanum
|
La
|
57
|
138.906
|
920 ± 5
|
|
Lawrencium
|
Lw
|
103
|
(260)
|
…
|
|
Lead
|
Pb
|
82
|
207.2
|
327.502
|
|
Lithium
|
Li
|
3
|
6.941
|
180.54
|
|
Lutetium
|
Lu
|
71
|
174.967
|
1656 ± 5
|
|
Magnesium
|
Mg
|
12
|
24.305
|
648.8 ± 0.5
|
|
Manganese
|
Mn
|
25
|
54.9380
|
1244 ± 2
|
|
Mendelevium
|
Md
|
101
|
(258)
|
…
|
|
Mercury
|
Hg
|
80
|
200.59
|
−38.87
|
|
Molybdenum
|
Mo
|
42
|
95.94
|
2617
|
|
Neodymium
|
Nd
|
60
|
144.24
|
1010
|
|
Neon
|
Ne
|
10
|
20.1179
|
−248.67
|
|
Neptunium
|
Np
|
93
|
237.048
|
640 ± 1
|
|
Nickel
|
Ni
|
28
|
58.69
|
1453
|
|
Niobium
|
Nb
|
41
|
92.9064
|
2468 ± 10
|
|
Nitrogen
|
N
|
7
|
14.0067
|
−209.86
|
|
Nobelium
|
No
|
102
|
(259)
|
…
|
|
Osmium
|
Os
|
76
|
190.2
|
3045 ± 30
|
|
Oxygen
|
O
|
8
|
15.9994
|
−218.4
|
|
Palladium
|
Pd
|
46
|
106.42
|
1554
|
|
Phosphorus
|
P
|
15
|
30.9738
|
44.1
|
|
Platinum
|
Pt
|
78
|
195.08
|
1772
|
|
Plutonium
|
Pu
|
94
|
(244)
|
641
|
|
Polonium
|
Po
|
84
|
(209)
|
254
|
|
Potassium
|
K
|
19
|
39.0938
|
63.25
|
|
Praseodymium
|
Pr
|
59
|
140.908
|
931 ± 4
|
|
Promethium
|
Pm
|
61
|
(145)
|
10802
|
|
Protactinium
|
Pa
|
91
|
231.0359
|
1600
|
|
Radium
|
Ra
|
88
|
226.025
|
700
|
|
Radon
|
Rn
|
86
|
(222)
|
−71
|
|
Rhenium
|
Re
|
75
|
186.207
|
3180
|
|
Rhodium
|
Rh
|
45
|
102.906
|
1965 ± 3
|
|
Rubidium
|
Rb
|
37
|
85.4678
|
38.89
|
|
Ruthenium
|
Ru
|
44
|
101.07
|
2310
|
|
Samarium
|
Sm
|
62
|
150.36
|
1072 ± 5
|
|
Scandium
|
Sc
|
21
|
44.9559
|
1539
|
|
Selenium
|
Se
|
34
|
78.96
|
217
|
|
Silicon
|
Si
|
14
|
28.0855
|
1410
|
|
Silver
|
Ag
|
47
|
107.868
|
961.93
|
|
Sodium
|
Na
|
11
|
22.9898
|
97.81 ± 0.03
|
|
Strontium
|
Sr
|
38
|
87.62
|
769
|
|
Sulfur
|
S
|
16
|
32.06
|
112.8
|
|
Tantalum
|
Ta
|
73
|
180.9479
|
2996
|
|
Technetium
|
Tc
|
43
|
(98)
|
2172
|
|
Tellurium
|
Te
|
52
|
127.60
|
449.5 ± 0.3
|
|
Terbium
|
Tb
|
65
|
158.925
|
1360 ± 4
|
|
Thallium
|
Tl
|
81
|
204.383
|
303.5
|
|
Thorium
|
Th
|
90
|
232.038
|
1750
|
|
Thulium
|
Tm
|
69
|
168.934
|
1545 ± 15
|
|
Tin
|
Sn
|
50
|
118.71
|
231.9681
|
|
Titanium
|
Ti
|
22
|
47.88
|
1660 ± 10
|
|
Tungsten
|
W
|
74
|
183.85
|
3410 ± 20
|
|
Unnilhexium
|
Unh
|
106
|
(266)
|
…
|
|
Unnilnonium
|
Unn
|
109
|
(266)
|
…
|
|
Unniloctium
|
Uno
|
108
|
(265)
|
…
|
|
Unnilpentium
|
Unp
|
105
|
(262)
|
…
|
|
Unnilquadium
|
Unq
|
104
|
(261)
|
…
|
|
Unnilseptium
|
Uns
|
107
|
(261)
|
…
|
|
Uranium
|
U
|
92
|
238.029
|
1132 ± 0.8
|
|
Vanadium
|
V
|
23
|
50.9415
|
1890 ± 10
|
|
Xenon
|
Xe
|
54
|
131.29
|
−111.9
|
|
Ytterbium
|
Yb
|
70
|
173.04
|
824 ± 5
|
|
Yttrium
|
Y
|
39
|
88.9059
|
1523 ± 8
|
|
Zinc
|
Zn
|
30
|
65.39
|
419.58
|
|
Zirconium
|
Zr
|
40
|
91.224
|
1852 ± 2
|
1 At 28 atm
b Approximate.
c Sublimates.
d At 26 atm.
Notes: Values in parentheses are atomic weights of the most stable known isotopes. Melting points at standard pressure except as noted.
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