Symbol
Pb
  
Pr
  
Group Number
Not Available
  
Period Number
6
  
6
  
Block
p block
  
f block
  
Element Family
Post-Transition
  
Lanthanide
  
Space Group Name
Fm_ 3m
  
P63/mmc
  
Interesting Facts
- Galena mineral contains almost 87% of Lead metal in it, Galena is sulfide mineral.
- The best available source of Lead metal today is by recycling automobile batteries.
  
- Praseodymium metal is synthetically produced metal.
- Praseodymium is used as possible fuel for radioactive generators.
  
Sources
Earth's crust, Found in Minerals, Mining, Ores of metals, Ores of Minerals
  
Found in Minerals, Mining, Ores of Minerals
  
History
  
  
Who Discovered
Unknown
  
Not Available
  
Discovery
In Middle Easterns (7000 BCE)
  
In 1885
  
Abundance
  
  
Abundance In Sun
~0.000001 %
  
18
~0.0000001 %
  
26
Abundance In Earth's Crust
Abundance In Humans
Not Available
  
Uses & Benefits
- It is also used in insecticides, hair dyes and as an anti-knocking additive for petrol. But all these are banned by the government as Lead metal is known for detrimental to health.
  
- The main use of Praseodymium include alloys. Praseodymium –Magnesium alloy is used in aircraft engines due to its high strength.
-
This metal is also used while making a permanent magnets.
  
Industrial Uses
Chemical Industry, Electrical Industry, Electronic Industry
  
Chemical Industry
  
Medical Uses
Surgical Instruments Manufacturing
  
NA
  
Other Uses
Alloys
  
Alloys
  
Biological Properties
  
  
Toxicity
Toxic
  
Moderately Toxic
  
Present in Human Body
Yes
  
No
  
In Blood
0.21 Blood/mg dm-3
  
11
Not Available
  
In Bone
30.00 p.p.m.
  
10
Not Available
  
Boiling Point
1,740.00 °C
  
99+
3,130.00 °C
  
27
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Gray
  
Grayish White
  
Luster
Metallic
  
Metallic
  
Hardness
  
  
Mohs Hardness
Not Available
  
Vickers Hardness
Not Available
  
Speed of Sound
1,190.00 m/s
  
99+
2,280.00 m/s
  
40
Optical Properties
  
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Pb
  
Pr
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Allen Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
715.60 kJ/mol
  
31
527.00 kJ/mol
  
99+
2nd Energy Level
1,450.50 kJ/mol
  
99+
1,020.00 kJ/mol
  
99+
3rd Energy Level
3,081.50 kJ/mol
  
23
2,086.00 kJ/mol
  
99+
4th Energy Level
4,083.00 kJ/mol
  
35
3,761.00 kJ/mol
  
99+
5th Energy Level
6,640.00 kJ/mol
  
20
5,551.00 kJ/mol
  
29
Electrochemical Equivalent
3.87 g/amp-hr
  
9
1.75 g/amp-hr
  
40
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes
  
Anti Corrosion, Ionization, Radioactive Isotopes
  
Electron Configuration
[Xe] 4f14 5d10 6s2 6p2
  
[Xe] 4f3 6s2
  
Crystal Structure
Face Centered Cubic (FCC)
  
Hexagonal Close Packed (HCP)
  
Crystal Lattice
FCC-Crystal-Structure-of-Lead.jpg#100
  
HCP-Crystal-Structure-of-Praseodymium.jpg#100
  
Atom
  
  
Radius of an Atom
  
  
Atomic Weight
140.91 amu
  
99+
Atomic Volume
18.17 cm3/mol
  
27
20.80 cm3/mol
  
15
Adjacent Atomic Numbers
  
  
Valence Electron Potential
24.20 (-eV)
  
99+
42.64 (-eV)
  
99+
Lattice Angles
π/2, π/2, π/2
  
π/2, π/2, 2 π/3
  
Lattice C/A Ratio
Not Available
  
Density
  
  
Density At Room Temperature
11.34 g/cm3
  
33
6.77 g/cm3
  
99+
Density When Liquid (at m.p.)
10.66 g/cm3
  
15
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
Ductile, Malleable
  
Ductile, Malleable
  
Magnetic Characteristics
  
  
Magnetic Ordering
Diamagnetic
  
Paramagnetic
  
Electrical Properties
  
  
Electrical Property
Poor Conductor
  
Conductor
  
Resistivity
208.00 nΩ·m
  
16
Electrical Conductivity
0.05 106/cm Ω
  
36
0.01 106/cm Ω
  
99+
Electron Affinity
35.10 kJ/mol
  
28
50.00 kJ/mol
  
21
Specific Heat
0.13 J/(kg K)
  
39
0.19 J/(kg K)
  
32
Molar Heat Capacity
26.65 J/mol·K
  
26
27.20 J/mol·K
  
18
Thermal Conductivity
35.30 W/m·K
  
38
12.50 W/m·K
  
99+
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
28.90 µm/(m·K)
  
13
6.70 µm/(m·K)
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
179.40 kJ/mol
  
99+
296.80 kJ/mol
  
29
Enthalpy of Fusion
4.77 kJ/mol
  
99+
6.89 kJ/mol
  
99+
Enthalpy of Atomization
194.60 kJ/mol
  
99+
368.00 kJ/mol
  
24
Standard Molar Entropy
64.80 J/mol.K
  
17
73.20 J/mol.K
  
10