Rb Rubidium – Element Information, Facts, Properties, Trends,Uses, Comparison with other elements

37
Rb
Rubidium

Rubidium

Element 37 of Periodic table is Rubidium with atomic number 37, atomic weight 85.4678. Rubidium, symbol Rb, has a Body Centered Cubic structure and Silver color. Rubidium is a alkali metal element. Trivial name of Rubidium is alkali metals*. Know everything about Rubidium Facts, Physical Properties, Chemical Properties, Electronic configuration, Atomic and Crystal Structure.

37 Rb - Rubidium | SchoolMyKids

Rubidium is a chemical element with symbol Rb and atomic number 37. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, such as very rapid oxidation in air.

How to Locate Rubidium 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 37 to find Rubidium 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 Rubidium on periodic table look for cross section of group 1 and period 5 in the modern periodic table.

Table of Contents

Rubidium History

The element Rubidium was discovered by Robert Bunsen in year 1861 in Germany . Rubidium derived its name from the Latin rubidus, meaning 'deep red'

Rubidium Presence: Abundance in Nature and Around Us

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

  Ppb by weight (1ppb =10^-7 %)
Abundance in Universe 1×10-6%
Abundance in Sun 3×10-6%
Abundance in Meteorites 3.2e-06
Abundance in Earth's Crust 6e-05
Abundance in Oceans 1.2e-07
Abundance in Humans 4.6e-06

Crystal Structure of Rubidium

The solid state structure of Rubidium 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
558.5 558.5 558.5 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 37 Rb Rubidium - Crystal Structure | SchoolMyKids
Space Group Number 229
Crystal Structure Body Centered Cubic

Rubidium Atomic and Orbital Properties

Rubidium atoms have 37 electrons and the electronic shell structure is [2, 8, 18, 8, 1] with Atomic Term Symbol (Quantum Numbers) 2S1/2.

Atomic Number 37
Number of Electrons (with no charge) 37
Number of Protons 37
Mass Number 85
Number of Neutrons 48
Shell structure (Electrons per energy level) [2, 8, 18, 8, 1]
Electron Configuration [Kr] 5s1
Valence Electrons 5s1
Oxidation State -1
1
Atomic Term Symbol (Quantum Numbers) 2S1/2

Shell Structure of Rubidium - Electrons per energy level

37 Rb Rubidium - 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
5 O 1

Ground State Electronic Configuration of Rubidium - neutral Rubidium atom

The ground state electronic configuration of Neutral Rubidium atom is [Kr] 5s1. The portion of Rubidium configuration that is equivalent to the noble gas of the preceding period, is abbreviated as [Kr]. 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 5s1, electrons in the outermost shell that determine the chemical properties of the element.

Unabbreviated electronic configuration of neutral Rubidium

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

1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s1

Atomic Structure of Rubidium

Rubidium atomic radius is 265 pm, while it's covalent radius is 211 pm.

Atomic Radius

265 pm (2.65 Å)

Atomic Volume 55.788381201 cm3
Covalent Radius 211 pm (2.11 Å)
Van der Waals Radius N/A
Neutron Cross Section 0.38 σa/barns

Atomic Spectrum of Rubidium

Atomic Spectrum of Rubidium | SchoolMyKids

Rubidium Chemical Properties: Rubidium Ionization Energies and electron affinity

The electron affinity of Rubidium is 46.9 kJ/mol

Valence 1
Electronegativity 0.82
ElectronAffinity 46.9 kJ/mol

Ionization Energy of Rubidium

Refer to table below for Ionization energies of Rubidium

Ionization energy number Enthalpy - kJ/mol
1 403
2 2633
3 3860
4 5080
5 6850
6 8140
7 9570
8 13120
9 1.45×104
10 26740

Rubidium Physical Properties

Refer to below table for Rubidium Physical Properties

Density 1.532 g/cm3
Molar Volume 55.788381201 cm3

Elastic Properties

Young Modulus 2.4 GPa
Shear Modulus N/A
Bulk Modulus 2.5 GPa
Poisson Ratio N/A

Hardness of Rubidium - Tests to Measure of Hardness of Element

Mohs Hardness 0.3 MPa
Vickers Hardness N/A
Brinell Hardness 0.216 MPa

Rubidium Electrical Properties

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

Electrical Conductivity 8.3×106 S/m
Resistivity 1.2×10-7 m Ω
Superconducting Point N/A

Rubidium Heat and Conduction Properties

Thermal Conductivity 58 W/(m K)
Thermal Expansion N/A

Rubidium Magnetic Properties

Magnetic Type Paramagnetic
Curie Point N/A
Mass Magnetic Susceptibility 2.6×10-9
Molar Magnetic Susceptibility 2.22×10-10
Volume Magnetic Susceptibility 3.98×10-6

Optical Properties of Rubidium

Refractive Index N/A

Acoustic Properties of Rubidium

Speed of Sound 1.3×103 m/s

Rubidium Thermal Properties - Enthalpies and thermodynamics

Refer to table below for Thermal properties of Rubidium

Melting Point 312.46 K (39.31 °C)
Boiling Point 961 K (688 °C)
Critical Temperature 2093 K
Superconducting Point N/A

Enthalpies of Rubidium

Heat of Fusion 2.19 kJ/mol
Heat of Vaporization 72 kJ/mol
Heat of Combustion N/A

Rubidium Isotopes - Nuclear Properties of Rubidium

Isotopes of rhodium. Naturally occurring Rubidium has 1 stable isotope - 85Rb.

Isotope Isotope Mass % Abundance T half Decay Mode
71Rb  
72Rb  
73Rb  
74Rb  
75Rb  
76Rb  
77Rb  
78Rb  
79Rb  
80Rb  
81Rb  
82Rb  
83Rb  
84Rb  
85Rb   72.17% Stable N/A
86Rb  
87Rb   27.83%
88Rb  
89Rb  
90Rb  
91Rb  
92Rb  
93Rb  
94Rb  
95Rb  
96Rb  
97Rb  
98Rb  
99Rb  
100Rb  
101Rb  
102Rb  

Regulatory and Health - Health and Safety Parameters and Guidelines

CAS Number CAS7440-17-7
RTECS Number RTECSVL8500000
DOT Hazard Class 4.3
DOT Numbers 1423
EU Number N/A
NFPA Fire Rating 3
NFPA Hazards Water Reactive
NFPA Health Rating 2
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) CAS7440-17-7
CID Number CID5357696
Gmelin Number N/A
NSC Number N/A
RTECS Number RTECSVL8500000

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