Sodium Cesium Comparison
Periodic Table
Symbol
Na
Cs
Group Number
1
17
1
17
Period Number
3
6
Block
s block
s block
Element Family
Alkali
Alkali
CAS Number
7440235
99+
7440462
40
Space Group Name
Im_ 3m
Im_ 3m
Space Group Number
229.00
1
229.00
1
Facts
Interesting Facts
- At room temperature Sodium metal is very soft as it can be chopped down into pieces with butter knife.
- The most common compound of Sodium is NaCl (Salt).
Not Available
Sources
By Electrolysis Process, Mining
Earth's crust, Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
Humphry Davy
Robert Bunsen and Gustav Kirchhoff
Discovery
In 1807
In 1860
Abundance
Abundance In Universe
2 * 10-3 %
6
8 * 10-8 %
24
Abundance In Sun
~0.004 %
6
~0.0000008 %
20
Abundance In Meteorites
0.55 %
6
0.00 %
38
Abundance In Earth's Crust
2.30 %
5
0.00 %
35
Abundance In Oceans
1.10 %
1
0.00 %
17
Abundance In Humans
0.14 %
3
0.00 %
17
Uses
Uses & Benefits
- In some nuclear reactors sodium is used as a heat exchanger.
- Compound of Sodium metals called Salt (Sodium chloride) is used in Food.
- The most common use of cesium metal is as a drilling fluid. It is also used in optical glass manufacturing.
- In vacuum tubes and radiation monitor equipment this metal is used as a catalyst promoter.
Industrial Uses
Electrical Industry, Electronic Industry
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry
Medical Uses
Pharmaceutical Industry
NA
Other Uses
Alloys
Alloys
Biological Properties
Toxicity
Toxic
Mildly Toxic
Present in Human Body
Yes
Yes
In Blood
1,970.00 Blood/mg dm-3
1
0.00 Blood/mg dm-3
28
In Bone
10,000.00 p.p.m.
2
0.05 p.p.m.
26
Physical Properties
Melting Point
97.72 °C
99+
28.50 °C
99+
Boiling Point
883.00 °C
99+
678.40 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silvery Gold
Luster
Metallic
NA
Hardness
Mohs Hardness
0.50
22
0.20
25
Brinell Hardness
0.69 MPa
99+
0.14 MPa
99+
Speed of Sound
3,200.00 m/s
24
Not Available
Optical Properties
Allotropes
No
No
α Allotropes
Not Available
Not Available
β Allotropes
Not Available
Not Available
γ Allotropes
Not Available
Not Available
Chemical Properties
Chemical Formula
Na
Cs
Isotopes
Known Isotopes
17
22
36
3
Electronegativity
Pauling Electronegativity
0.93
99+
0.79
99+
Sanderson Electronegativity
0.56
30
0.22
33
Allred Rochow Electronegativity
1.01
35
0.86
99+
Mulliken-Jaffe Electronegativity
0.91
21
0.62
26
Allen Electronegativity
0.87
99+
0.66
99+
Electropositivity
Pauling Electropositivity
3.07
6
3.21
2
Ionization Energies
1st Energy Level
495.80 kJ/mol
99+
375.70 kJ/mol
99+
2nd Energy Level
4,562.00 kJ/mol
4
2,234.30 kJ/mol
8
3rd Energy Level
6,910.30 kJ/mol
6
3,400.00 kJ/mol
16
4th Energy Level
9,543.00 kJ/mol
5
Not Available
5th Energy Level
13,354.00 kJ/mol
4
Not Available
6th Energy Level
16,613.00 kJ/mol
4
Not Available
7th Energy level
20,117.00 kJ/mol
4
Not Available
8th Energy Level
25,496.00 kJ/mol
4
Not Available
9th Energy Level
28,932.00 kJ/mol
4
Not Available
10th Energy Level
141,362.00 kJ/mol
2
Not Available
11th Energy Level
159,076.00 kJ/mol
2
Not Available
Electrochemical Equivalent
0.86 g/amp-hr
99+
4.96 g/amp-hr
3
Electron Work Function
2.75 eV
40
2.14 eV
99+
Other Chemical Properties
Chemical Stability, Corrosion, Flammability, Ionization, Solubility
Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility
Atomic Properties
Atomic Number
11
99+
55
99+
Electron Configuration
[Ne] 3s1
[Xe] 6s1
Crystal Structure
Body Centered Cubic (BCC)
Body Centered Cubic (BCC)
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
11
99+
55
99+
Number of Neutrons
12
99+
78
99+
Number of Electrons
11
99+
55
99+
Radius of an Atom
Atomic Radius
186.00 pm
9
265.00 pm
1
Covalent Radius
166.00 pm
27
244.00 pm
2
Van der Waals Radius
227.00 pm
21
343.00 pm
2
Atomic Weight
22.99 amu
99+
132.91 amu
99+
Atomic Volume
23.70 cm3/mol
10
71.07 cm3/mol
1
Adjacent Atomic Numbers
Valence Electron Potential
14.10 (-eV)
99+
8.62 (-eV)
99+
Lattice Constant
429.06 pm
19
614.10 pm
5
Lattice Angles
π/2, π/2, π/2
π/2, π/2, π/2
Lattice C/A Ratio
Not Available
Not Available
Mechanical Properties
Density
Density At Room Temperature
0.97 g/cm3
99+
1.93 g/cm3
99+
Density When Liquid (at m.p.)
0.93 g/cm3
99+
1.84 g/cm3
99+
Tensile Strength
Not Available
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Shear Modulus
3.30 GPa
99+
Not Available
Bulk Modulus
6.30 GPa
99+
1.60 GPa
99+
Young's Modulus
10.00 GPa
99+
1.70 GPa
99+
Poisson Ratio
Not Available
Not Available
Other Mechanical Properties
NA
Ductile
Magnetic Properties
Magnetic Characteristics
Specific Gravity
0.97
99+
1.87
99+
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Semiconductor
Resistivity
47.70 nΩ·m
99+
205.00 nΩ·m
17
Electrical Conductivity
0.21 106/cm Ω
9
0.05 106/cm Ω
35
Electron Affinity
52.80 kJ/mol
19
45.50 kJ/mol
25
Thermal Properties
Specific Heat
1.23 J/(kg K)
3
0.24 J/(kg K)
23
Molar Heat Capacity
28.23 J/mol·K
10
32.21 J/mol·K
4
Thermal Conductivity
142.00 W/m·K
11
35.90 W/m·K
36
Critical Temperature
2,573.00 K
2
1,938.00 K
5
Thermal Expansion
71.00 µm/(m·K)
4
97.00 µm/(m·K)
1
Enthalpy
Enthalpy of Vaporization
89.04 kJ/mol
99+
65.90 kJ/mol
99+
Enthalpy of Fusion
2.59 kJ/mol
99+
2.10 kJ/mol
99+
Enthalpy of Atomization
108.40 kJ/mol
99+
78.20 kJ/mol
99+
Standard Molar Entropy
51.30 J/mol.K
28
85.20 J/mol.K
3
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