Helium @ Periodic Table of Chemical Elements - Chemistry Online Education

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1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

I

II

IIIb

IVb

Vb

VIb

VIIb

VIIIb

Ib

IIb

III

IV

V

VI

VII

VIII

₁₀Ne
20.179

₁₁Na
22.989

₁₂Mg
24.305

₁₃Al
26.981

₁₄Si
28.085

₁₇Cl
35.453

₁₈Ar
39.948

₂₀Ca
40.078

₂₁Sc
44.955

₂₂Ti
47.867

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

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

₅₄Xe
131.29

₅₅Cs
132.90

₅₆Ba
137.32

₅₇La
138.90

₇₂Hf
178.49

₇₃Ta
180.94

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

₁₀₉Mt

₁₁₀Ds

₁₁₁Rg

₁₁₂Uub

₁₁₃Uut

₁₁₄Uuq

₁₁₅Uup

₁₁₆Uuh

₁₁₇Uus

₁₁₈Uuo

Lanthanoids

₅₈Ce
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

Actinoids

₉₀Th
232.03

₉₁Pa
231.03

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

He

Helium

He

Helium

Atomic number		2
Atomic weight		4.0026022 amu
Density		0.0001785 g/cm³ (STP)
Melting		-272.2 °C
Boiling		-268.9 °C
Covalent radius		0.32 Å
Van der Waals radius		1.40 Å
Ionic radius		Å
First ionization potential		24.587 eV = 198308 cm^-1 = 2372.3 kJ/mol
Electron affinity		0.218 eV = 1755 cm^-1 = 21.0 kJ/mol
Electronic configuration		1s²
Stable isotopes		³He: 0.000138%, ⁴He: 99.999862%
More about Helium

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