Radium Element (Periodic Table)

Radium

Radium (Ra) is a chemical element of the periodic table, located in the group 2 and the period 7, and has the atomic number 88. It is a soft, lustrous, silvery-white alkaline earth metal, whose name comes from the Latin word “radius”, which means ray. It is highly toxic and is counted as one of the radioactive elements. It is the heaviest alkaline earth metal.

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 Radium Element

Radium
‣ What does radium look like?

Appearance: silvery white metallic
‣ When was radium discovered and by whom?

Discovery: Pierre and Marie Curie (1898)
First isolation: Marie Curie (1910)
‣ Where is radium located on the periodic table?

Radium Periodic Table

Location: Radium is found in the second column of the periodic table, next to the francium element.
‣ What is the atomic number of radium?

Atomic number (Z): 88
‣ What is the symbol of radium?

Symbol: Ra
‣ What is the atomic weight of radium?

Atomic weight: [226]
‣ What block is radium in?

Block: s-block
‣ What group does radium belong to?

Group: 2 (alkaline earth metals)
‣ What period is radium in the periodic table?

Period: 7
Radium covalent radius: 221±2 pm
Radium Van der Waals radius: 283 pm
‣ What is radium’s melting point?

Melting point: 973 K (700 °C, 1292 °F) (disputed)
‣ What is radium’s boiling point?

Boiling point: 2010 K (1737 °C, 3159 °F)
‣ How many electron shells does radium have?

Electrons per shell: 2, 8, 18, 32, 18, 8, 2
‣ What is the electron configuration of radium?

Electron configuration: [Rn] 7s2
‣ What is the ionization energy of radium?

Ionization energies:
1st: 509.3 kJ/mol
2nd: 979.0 kJ/mol
‣ What is the phase of radium?

Phase (at r.t): solid
‣ What is radium’s density?

Density (near r.t): 5.5 g/cm3
Radium magnetic ordering: nonmagnetic
Radium natural occurrence: from decay
Radium oxidation state: +2
‣ What’s the electronegativity of radium?

Electronegativity: Pauling scale: 0.9
Radium heat of fusion: 8.5 kJ/mol
Radium heat of vaporization: 113 kJ/mol
‣ What is the crystal structure of radium?

Crystal structure: body-centered cubic (bcc)
Thermal conductivity of radium: 18.6 W/(m.K)
Radium electrical resistivity: 1 nΩ.m (at 20 °C)
Radium CAS number: 7440-14-4

‣ Radium vapor pressure

Vapor pressure
P (Pa)1101001 k10 k100 k
at T (K)8199061037120914461799

‣ How many isotopes does radium have?

Main isotopes of radium
IsotopeAbundanceHalf-life (t1/2)Decay modeProduct
223Ratrace11.43 dα219Rn
224Ratrace3.6319 dα220Rn
225Ratrace14.9 dβ225Rn
226Ratrace1600 yα222Rn
228Ratrace5.75 yβ228Rn

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