Helium Element (Periodic Table)

Helium

Helium (He) is a chemical element of the periodic table, located in the group 18 and the period 1, and is having the atomic number 2. It is a colorless, odorless, tasteless, non-toxic gas, whose name comes from the Greek word “helios”, which means sun. It is the first element in the noble gas group. It is the second lightest element, after the hydrogen element.

group
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
period
1
1
H
2
He
2
3
Li
4
Be
5
B
6
C
7
N
8
O
9
F
10
Ne
3
11
Na
12
Mg
13
Al
14
Si
15
P
16
S
17
Cl
18
Ar
4
19
K
20
Ca
21
Sc
22
Ti
23
V
24
Cr
25
Mn
26
Fe
27
Co
28
Ni
29
Cu
30
Zn
31
Ga
32
Ge
33
As
34
Se
35
Br
36
Kr
5
37
Rb
38
Sr
39
Y
40
Zr
41
Nb
42
Mo
43
Tc
44
Ru
45
Rh
46
Pd
47
Ag
48
Cd
49
In
50
Sn
51
Sb
52
Te
53
I
54
Xe
6
55
Cs
56
Ba
72
Hf
73
Ta
74
W
75
Re
76
Os
77
Ir
78
Pt
79
Au
80
Hg
81
Tl
82
Pb
83
Bi
84
Po
85
At
86
Rn
7
87
Fr
88
Ra
104
Rf
105
Db
106
Sg
107
Bh
108
Hs
109
Mt
110
Ds
111
Rg
112
Cn
113
Nh
114
Fl
115
Mc
116
Lv
117
Ts
118
Og
57
La
58
Ce
59
Pr
60
Nd
61
Pm
62
Sm
63
Eu
64
Gd
65
Tb
66
Dy
67
Ho
68
Er
69
Tm
70
Yb
71
Lu
89
Ac
90
Th
91
Pa
92
U
93
Np
94
Pu
95
Am
96
Cm
97
Bk
98
Cf
99
Es
100
Fm
101
Md
102
No
103
Lr
– s block

FAQs on Helium Element

Helium
‣ What does helium look like?

Appearance: colorless gas, exhibiting a gray cloudy glow (or reddish-orange if an especially high voltage is used) when placed in an electric field
‣ When was helium discovered and by whom?

Discovery: Pierre Janssen Norman Lockyer (1868)
First isolation: William Ramsay, Per Teodor Cleve, Abraham Langlet (1895)
‣ Where is helium located on the periodic table?

Helium Periodic Table

Location: Helium is found in the eighteenth column of the periodic table above the neon element.
‣ What is helium’s atomic number?

Atomic number (Z): 2
‣ What is the correct symbol for helium?

Symbol: He
‣ What is the atomic weight of helium?

Standard atomic weight: 4.002602
‣ Helium belongs to which block?

Block: s-block
‣ What group is helium in on the periodic table?

Group: 18 (noble gases)
‣ What period is helium in on the periodic table?

Period: 1
Helium covalent radius: 28 pm
Helium Van der Waals radius: 140 pm
‣ What is helium’s melting point?

Melting point: 0.95 K (-272.20 °C, -457.96 °F) (at 2.5 MPa)
‣ What’s the boiling point of helium?

Boiling point: 4.222 K (-268.928 °C, -452.070 °F)
Helium critical point: 5.1953 K, 0.22746 MPa
Helium triple point: 2.177 K, 5.043 kPa
‣ How many electron shells does helium have?

Electrons per shell: 2
‣ What is helium’s electron configuration?

Electron configuration: 1s2
‣ What is helium ionization energy?

Ionization energies:
1st: 2372.3 kJ/mol
2nd: 5250.5 kJ/mol
‣ In what phase is helium normally found?

Phase (at r.t): gas
‣ What is the density of helium at STP?

Density (at STP): 0.1786 g/L
when liquid (at m.p): 0.145 g/cm3
when liquid (at b.p): 0.125 g/cm3
Helium magnetic ordering: diamagnetic
Helium natural occurrence: primordial
Helium oxidation state: 0
‣ What is helium electronegativity?

Electronegativity: Pauling scale: no data
Helium heat of fusion: 0.0138 kJ/mol
Helium heat of vaporization: 0.0829 kJ/mol
Helium molar heat capacity: 20.78 J/(mol K)
Helium molar magnetic susceptibility: -1.88 × 10-6 cm3/mol (298 K)
Speed of sound in helium: 972 m/s
‣ What is the crystal structure of helium?

Crystal structure: hexagonal close-packed (hcp)
Thermal conductivity of helium: 0.1513 W/(m.K)
Helium CAS number: 7440-59-7

‣ Helium vapor pressure

Vapor pressure (defined by ITS-90)
P (Pa)1101001 k10 k100 k
at T (K)1.231.672.484.21

‣ How many isotopes does helium have?

Main isotopes of helium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
3He0.0002 %stable
4He99.9998 %stable

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