Helium

Helium
Identification
Symbol	He
Block	S-Block
Group	Group 18
Period	Period 1
Atomic Information
Atomic Number	2
Atomic Radius	28 pm
Mass	4.003 Ar
Category	Noble Gases
Standard state(298 K)	Gas
Electronic Configuration	Not given
Electronegativity (Pauling)	Unknown
Electron affinity	Unknown
First ionisation energy	Unknown
Physical Properties
Color	Colorless
Melting Point	0.95 K
Boiling Point	4.222 K
Density of solid	Unknown
Reflectivity	Unknown
Heat Properties
Enthalpy of fusion	Unknown
Enthalpy of atomisation	Unknown
Enthalpy of vaporisation	Unknown

Helium() is the 2^nd element in the periodic table according to its atomic number 2.  Helium is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert monatomic gas that ranks first in the noble gas group on the periodic chart. It has the lowest boiling point of any element, and under typical pressures, it does not melt.

Periodic Table

1 H

2 He

3 Li

4 Be

5 B

6 C

7 N

8 O

9 F

10 Ne

11 Na

12 Mg

13 Al

14 Si

15 P

16 S

17 Cl

18 Ar

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

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

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

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

119 Uue

120 Ubn

***

158 Ups

159 Upo

160 Upe

161 Uhn

*

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