Ra Radium – Element Information, Facts, Properties, Trends,Uses, Comparison with other elements

88
Ra
Radium

Radium

Element 88 of Periodic table is Radium with atomic number 88, atomic weight 226. Radium, symbol Ra, has a Body Centered Cubic structure and Silver color. Radium is a alkaline earth metal element. Trivial name of Radium is alkaline earth metals*. Know everything about Radium Facts, Physical Properties, Chemical Properties, Electronic configuration, Atomic and Crystal Structure.

88 Ra - Radium | SchoolMyKids

Radium is a chemical element with symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is almost colorless, but it readily combines with nitrogen (rather than oxygen) on exposure to air, forming a black surface layer of radium nitride (Ra3N2).

How to Locate Radium on Periodic Table

Periodic table is arranged by atomic number, number of protons in the nucleus which is same as number of electrons. The atomic number increases from left to right. Periodic table starts at top left ( Atomic number 1) and ends at bottom right (atomic number 118). Therefore you can directly look for atomic number 88 to find Radium on periodic table.

Another way to read periodic table and locate an element is by using group number (column) and period number (row). To locate Radium on periodic table look for cross section of group 2 and period 7 in the modern periodic table.

Table of Contents

Radium History

The element Radium was discovered by Pierre Curie in year 1898 in France . Radium derived its name from the Latin radius, 'ray'

Radium Presence: Abundance in Nature and Around Us

The table below shows the abundance of Radium in Universe, Sun, Meteorites, Earth's Crust, Oceans and Human Body.

  Ppb by weight (1ppb =10^-7 %)
Abundance in Universe N/A
Abundance in Sun N/A
Abundance in Meteorites N/A
Abundance in Earth's Crust 9.9×10-12%
Abundance in Oceans 1×10-15%
Abundance in Humans 1×10-13%

Crystal Structure of Radium

The solid state structure of Radium is Body Centered Cubic.

The Crystal structure can be described in terms of its unit Cell. The unit Cells repeats itself in three dimensional space to form the structure.

Unit Cell Parameters

The unit cell is represented in terms of its lattice parameters, which are the lengths of the cell edges Lattice Constants (a, b and c)

a b c
514.8 514.8 514.8 pm

and the angles between them Lattice Angles (alpha, beta and gamma).

alpha beta gamma
π/2 π/2 π/2

The positions of the atoms inside the unit cell are described by the set of atomic positions ( xi, yi, zi) measured from a reference lattice point.

The symmetry properties of the crystal are described by the concept of space groups. All possible symmetric arrangements of particles in three-dimensional space are described by the 230 space groups (219 distinct types, or 230 if chiral copies are considered distinct.

Space Group Name Im_ 3m 88 Ra Radium - Crystal Structure | SchoolMyKids
Space Group Number 229
Crystal Structure Body Centered Cubic

Radium Atomic and Orbital Properties

Radium atoms have 88 electrons and the electronic shell structure is [2, 8, 18, 32, 18, 8, 2] with Atomic Term Symbol (Quantum Numbers) 1S0.

Atomic Number 88
Number of Electrons (with no charge) 88
Number of Protons 88
Mass Number 226
Number of Neutrons 138
Shell structure (Electrons per energy level) [2, 8, 18, 32, 18, 8, 2]
Electron Configuration [Rn] 7s2
Valence Electrons 7s2
Oxidation State 2
Atomic Term Symbol (Quantum Numbers) 1S0

Shell Structure of Radium - Electrons per energy level

88 Ra Radium - Electron Shell Structure | SchoolMyKids
n s p d f
1 K 2
2 L 2 6
3 M 2 6 10
4 N 2 6 10 14
5 O 2 6 10
6 P 2 6
7 Q 2

Ground State Electronic Configuration of Radium - neutral Radium atom

The ground state electronic configuration of Neutral Radium atom is [Rn] 7s2. The portion of Radium configuration that is equivalent to the noble gas of the preceding period, is abbreviated as [Rn]. For atoms with many electrons, this notation can become lengthy and so an abbreviated notation is used.This is important as it is the Valence electrons 7s2, electrons in the outermost shell that determine the chemical properties of the element.

Unabbreviated electronic configuration of neutral Radium

Complete ground state electronic configuration for the Radium atom, Unabbreviated electronic configuration

1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 7s2

Atomic Structure of Radium

Radium atomic radius is N/A, while it's covalent radius is N/A.

Atomic Radius

Atomic Volume 45.2 cm3
Covalent Radius N/A
Van der Waals Radius N/A
Neutron Cross Section 20 σa/barns

Atomic Spectrum of Radium

Atomic Spectrum of Radium | SchoolMyKids

Radium Chemical Properties: Radium Ionization Energies and electron affinity

The electron affinity of Radium is N/A

Valence 2
Electronegativity 0.9
ElectronAffinity N/A

Ionization Energy of Radium

Refer to table below for Ionization energies of Radium

Ionization energy number Enthalpy - kJ/mol
1 509.3
2 979

Radium Physical Properties

Refer to below table for Radium Physical Properties

Density 5 g/cm3
Molar Volume 45.2 cm3

Elastic Properties

Young Modulus N/A
Shear Modulus N/A
Bulk Modulus N/A
Poisson Ratio N/A

Hardness of Radium - Tests to Measure of Hardness of Element

Mohs Hardness N/A
Vickers Hardness N/A
Brinell Hardness N/A

Radium Electrical Properties

Radium is Conductor of electricity. Refer to table below for the Electrical properties of Radium

Electrical Conductivity 1×106 S/m
Resistivity 1×10-6 m Ω
Superconducting Point N/A

Radium Heat and Conduction Properties

Thermal Conductivity 19 W/(m K)
Thermal Expansion N/A

Radium Magnetic Properties

Magnetic Type N/A
Curie Point N/A
Mass Magnetic Susceptibility N/A
Molar Magnetic Susceptibility N/A
Volume Magnetic Susceptibility N/A

Optical Properties of Radium

Refractive Index N/A

Acoustic Properties of Radium

Speed of Sound N/A

Radium Thermal Properties - Enthalpies and thermodynamics

Refer to table below for Thermal properties of Radium

Melting Point 973 K (700 °C)
Boiling Point 2010 K (1737 °C)
Critical Temperature N/A
Superconducting Point N/A

Enthalpies of Radium

Heat of Fusion 8 kJ/mol
Heat of Vaporization 125 kJ/mol
Heat of Combustion N/A

Radium Isotopes - Nuclear Properties of Radium

Isotopes of rhodium. Naturally occurring Radium has 1 stable isotope - None.

Isotope Isotope Mass % Abundance T half Decay Mode
202Ra  
203Ra  
204Ra  
205Ra  
206Ra  
207Ra  
208Ra  
209Ra  
210Ra  
211Ra  
212Ra  
213Ra  
214Ra  
215Ra  
216Ra  
217Ra  
218Ra  
219Ra  
220Ra  
221Ra  
222Ra  
223Ra  
224Ra  
225Ra  
226Ra  
227Ra  
228Ra  
229Ra  
230Ra  
231Ra  
232Ra  
233Ra  
234Ra  

Regulatory and Health - Health and Safety Parameters and Guidelines

CAS Number CAS7440-14-4
RTECS Number N/A
DOT Hazard Class N/A
DOT Numbers N/A
EU Number EU231-122-4
NFPA Fire Rating N/A
NFPA Hazards N/A
NFPA Health Rating N/A
NFPA Reactivity Rating N/A
Autoignition Point N/A
Flashpoint N/A

Database Search

List of unique identifiers to search the element in various chemical registry databases

Database Identifier number
CAS Number - Chemical Abstracts Service (CAS) CAS7440-14-4
CID Number CID6328144
Gmelin Number Gmelin40437
NSC Number N/A
RTECS Number N/A

List of Elements
1 H - Hydrogen
2 He - Helium
3 Li - Lithium
4 Be - Beryllium
5 B - Boron
6 C - Carbon
7 N - Nitrogen
8 O - Oxygen
9 F - Fluorine
10 Ne - Neon
11 Na - Sodium
12 Mg - Magnesium
13 Al - Aluminium
14 Si - Silicon
15 P - Phosphorus
16 S - Sulfur
17 Cl - Chlorine
18 Ar - Argon
19 K - Potassium
20 Ca - Calcium
21 Sc - Scandium
22 Ti - Titanium
23 V - Vanadium
24 Cr - Chromium
25 Mn - Manganese
26 Fe - Iron
27 Co - Cobalt
28 Ni - Nickel
29 Cu - Copper
30 Zn - Zinc
31 Ga - Gallium
32 Ge - Germanium
33 As - Arsenic
34 Se - Selenium
35 Br - Bromine
36 Kr - Krypton
37 Rb - Rubidium
38 Sr - Strontium
39 Y - Yttrium
40 Zr - Zirconium
41 Nb - Niobium
42 Mo - Molybdenum
43 Tc - Technetium
44 Ru - Ruthenium
45 Rh - Rhodium
46 Pd - Palladium
47 Ag - Silver
48 Cd - Cadmium
49 In - Indium
50 Sn - Tin
51 Sb - Antimony
52 Te - Tellurium
53 I - Iodine
54 Xe - Xenon
55 Cs - Cesium
56 Ba - Barium
57 La - Lanthanum
58 Ce - Cerium
59 Pr - Praseodymium
60 Nd - Neodymium
61 Pm - Promethium
62 Sm - Samarium
63 Eu - Europium
64 Gd - Gadolinium
65 Tb - Terbium
66 Dy - Dysprosium
67 Ho - Holmium
68 Er - Erbium
69 Tm - Thulium
70 Yb - Ytterbium
71 Lu - Lutetium
72 Hf - Hafnium
73 Ta - Tantalum
74 W - Tungsten
75 Re - Rhenium
76 Os - Osmium
77 Ir - Iridium
78 Pt - Platinum
79 Au - Gold
80 Hg - Mercury
81 Tl - Thallium
82 Pb - Lead
83 Bi - Bismuth
84 Po - Polonium
85 At - Astatine
86 Rn - Radon
87 Fr - Francium
88 Ra - Radium
89 Ac - Actinium
90 Th - Thorium
91 Pa - Protactinium
92 U - Uranium
93 Np - Neptunium
94 Pu - Plutonium
95 Am - Americium
96 Cm - Curium
97 Bk - Berkelium
98 Cf - Californium
99 Es - Einsteinium
100 Fm - Fermium
101 Md - Mendelevium
102 No - Nobelium
103 Lr - Lawrencium
104 Rf - Rutherfordium
105 Db - Dubnium
106 Sg - Seaborgium
107 Bh - Bohrium
108 Hs - Hassium
109 Mt - Meitnerium
110 Ds - Darmstadtium
111 Rg - Roentgenium
112 Cn - Copernicium
113 Nh - Nihonium
114 Fl - Flerovium
115 Mc - Moscovium
116 Lv - Livermorium
117 Ts - Tennessine
118 Og - Oganesson
Metalloid
Nonmetals
Other Nonmetals
Halogens Noble Gas
Metals
Alkali Metals Alkaline Earth Metals
Transition Metals Post-Transition Metals
Lanthanide Actinide