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Helium @ Periodic Table of Chemical Elements

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IIIIIIbIVb VbVIbVIIbVIIIbIb IIbIIIIVVVI VIIVIII
1H
1.0079
2He
4.0026
3Li
6.9412
4Be
9.0121
5B
10.811
6C
12.010
7N
14.006
8O
15.999
9F
18.998
10Ne
20.179
11Na
22.989
12Mg
24.305
13Al
26.981
14Si
28.085
15P
30.973
16S
32.065
17Cl
35.453
18Ar
39.948
19K
39.098
20Ca
40.078
21Sc
44.955
22Ti
47.867
23V
50.941
24Cr
51.996
25Mn
54.938
26Fe
55.845
27Co
58.933
28Ni
58.693
29Cu
63.546
30Zn
65.409
31Ga
69.723
32Ge
72.641
33As
74.921
34Se
78.963
35Br
79.904
36Kr
83.798
37Rb
85.467
38Sr
87.621
39Y
88.905
40Zr
91.224
41Nb
92.906
42Mo
95.942
43Tc
98.906
44Ru
101.07
45Rh
102.90
46Pd
106.42
47Ag
107.86
48Cd
112.41
49In
114.81
50Sn
118.71
51Sb
121.76
52Te
127.60
53I
126.90
54Xe
131.29
55Cs
132.90
56Ba
137.32
57La
138.90
72Hf
178.49
73Ta
180.94
74W
183.84
75Re
186.20
76Os
190.23
77Ir
192.21
78Pt
195.08
79Au
196.96
80Hg
200.59
81Tl
204.38
82Pb
207.21
83Bi
208.98
84Po
208.98
85At
209.98
86Rn
222.01
87Fr
223.01
88Ra
226.02
89Ac
227.02
104Rf
261.10
105Db
262.11
106Sg
266.12
107Bh
264.12
108Hs
269
109Mt
278
110Ds
281
111Rg
282
112Cn
285
113Nh
286
114Fl
289
115Mc
290
116Lv
293
117Ts
294
118Og
294
Lanthanoids58Ce
140.11
59Pr
140.90
60Nd
144.24
61Pm
146.91
62Sm
150.36
63Eu
151.96
64Gd
157.25
65Tb
158.92
66Dy
162.50
67Ho
164.93
68Er
167.25
69Tm
168.93
70Yb
173.04
71Lu
174.96
Actinoids90Th
232.03
91Pa
231.03
92U
238.02
93Np
237.04
94Pu
244.06
95Am
243.06
96Cm
247.07
97Bk
247.07
98Cf
251.07
99Es
252.08
100Fm
257.09
101Md
258.09
102No
259.10
103Lr
260.10
Alkali metals Alkali earth metals Transition metals Other metals Semi-metals Non-metals Noble gases

2

He

Helium

4.0026022

2
Helium photo
PropertyValue
Atomic number2
Atomic weight4.0026022 amu
Element familyNobel gases
Electronic configuration1s2
Stable and very long lived isotopes3He: 0.000138%, 4He: 99.999862%
Previous elementHydrogen
Next elementLithium
Density 0.0001785 g/cm3 (STP)
Melting -272.2 °C
Boiling -268.9 °C
Covalent radius 0.46 Å
Van der Waals radius 1.4 Å
First ionization potential 24.587 eV
Electron affinity -0.500 eV
Discovery year1868
Sample compounds
He2
HHe
He3
He4
HeO2
HeO
Helium is an element number 2 from nobel gases family. Its symbol is He. Helium atomic weight is 4.0026022 amu. He stable and long lived isotopes are 3He: 0.000138%, 4He: 99.999862%. Helium electronic configuration is 1s2. Sample compounds that contain Helium are He2, HHe, He3, He4, HeO2, HeO.
Periodict table
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