Helium Element (Periodic Table)

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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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