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Properties of Chromium and Lead

Chromium
Lead
Properties of Lead & Chromium


Physical Properties
Melting Point
1,857.00 °C   
14
327.50 °C   
99+
Boiling Point
2,672.00 °C   
39
1,740.00 °C   
99+
Hardness
  
  
Mohs Hardness
8.50   
1
1.50   
18
Brinell Hardness
687.00 MPa   
16
38.00 MPa   
99+
Vickers Hardness
1,060.00 MPa   
10
Not Available   
Optical Properties
  
  
Refractive Index
Not Available   
Not Available   
Reflectivity
Not Available   
Not Available   
Speed of Sound
5,940.00 m/s   
5
1,190.00 m/s   
99+
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
Cr   
Pb   
Isotopes
  
  
Known Isotopes
21   
18
35   
4
Electronegativity
  
  
Pauling Electronegativity
1.66   
18
1.87   
13
Sanderson Electronegativity
1.66   
14
2.29   
4
Allred Rochow Electronegativity
1.56   
10
1.55   
11
Mulliken-Jaffe Electronegativity
Not Available   
2.41   
2
Allen Electronegativity
1.65   
19
1.85   
8
Electropositivity
  
  
Pauling Electropositivity
2.34   
36
1.67   
99+
Ionization Energies
  
  
1st Energy Level
26,130.00 kJ/mol   
1
715.60 kJ/mol   
31
2nd Energy Level
28,750.00 kJ/mol   
1
1,450.50 kJ/mol   
99+
3rd Energy Level
34,230.00 kJ/mol   
1
3,081.50 kJ/mol   
23
Electrochemical Equivalent
0.32 g/amp-hr   
99+
3.87 g/amp-hr   
9
Electron Work Function
4.50 eV   
14
4.25 eV   
21
Other Chemical Properties
?
Anti-corrosion metals have the protection on their surfaces which protect them from corroding in corrosive environments.Anti Corrosion, 
?
Stable metals are non radioactive metals and have zero valence electrons in the outer shell.Chemical Stability, 
?
Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.Ionization, 
?
Radioactive metals emit particles and radiation from their nuclei. This process comes in the picture because their nuclei experience the intense conflict between two strong forces. This metal also have radioactive isotopes.Radioactive Isotopes, 
?
Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent.Solubility   
?
Anti-corrosion metals have the protection on their surfaces which protect them from corroding in corrosive environments.Anti Corrosion, 
?
Ionization is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.Ionization, 
?
Radioactive metals emit particles and radiation from their nuclei. This process comes in the picture because their nuclei experience the intense conflict between two strong forces. This metal also have radioactive isotopes.Radioactive Isotopes   
Mechanical Properties
Density
  
  
Density At Room Temperature
7.19 g/cm3   
99+
11.34 g/cm3   
33
Density When Liquid (at m.p.)
6.30 g/cm3   
40
10.66 g/cm3   
15
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)   
24
1.64 (Pa)   
7
Vapor Pressure at 2000 K
774.00 (Pa)   
1
Not Available   
Tensile Strength
689.00 MPa   
7
12.00 MPa   
20
Viscosity
Not Available   
Not Available   
Elasticity properties
  
  
Shear Modulus
115.00 GPa   
9
5.60 GPa   
99+
Bulk Modulus
160.00 GPa   
11
46.00 GPa   
24
Young's Modulus
279.00 GPa   
8
16.00 GPa   
99+
Poisson Ratio
0.21   
32
0.44   
3
Other Mechanical Properties
NA   
?
Ductility of metals defines their ability to deform under tensile stress; this is often characterized by the metals ability to be stretched into a wire.Ductile, 
?
Malleability of metals defines their ability to deform under compressive stress; this is often characterized by the metals ability to form a thin sheet by hammering or rolling.Malleable   
Periodic Table
Symbol
Cr   
Pb   
Group Number
6   
12
14   
4
Period Number
4   
6   
Block
?
The d-block is on the middle of the periodic table and includes elements from columns 3 through 12. These elements are also known as the transition metals because they show a transitivity in their properties i.e. they show a trend in their properties.d block   
?
The p-block is on the right side of the periodic table and includes elements from the six columns beginning with column 13 and ending with column 18. Helium, though being in the top of group 18, is not included in the p-block.p block   
Element Family
?
What is Transition Metal? All transition metals are placed under the d-block from group number 3 to 12. Transition metals show characteristics like malleability, ductility and are good conductor of electricity.Transition Metal   
?
All post transition metals are placed in group number 13, 14 and 15 of periodic table. In fact, they are located between Transition Metals and Metalloids. Post transition metals have very poor mechanical properties.Post-​Transition   
Atomic Properties
Atomic Number
24   
99+
82   
34
Atomic Weight
52.00 amu   
99+
207.20 amu   
30
Atomic Volume
7.23 cm3/mol   
99+
18.17 cm3/mol   
27
Electron Configuration
[Ar] 3d5 4s1   
[Xe] 4f14 5d10 6s2 6p2   
Valence Electron Potential
170.00 (-eV)   
4
24.20 (-eV)   
99+
Atom
  
  
Number of Protons
24   
99+
82   
34
Number of Neutrons
28   
99+
125   
19
Number of Electrons
24   
99+
82   
34
Crystal Structure
?
BCC is a basis type of cubic crystal structure. In crystallography, the cubic crystals structure is a crystal system where the unit cell has a cube shaped structure. This is one of the simplest crystal structure found in crystals of metal.Body Centered Cubic (BCC)   
?
In crystallography, the cubic (or isometric) crystal system is a crystal system where the unit cell is in the shape of a cube. This is one of the most common and simplest shapes found in crystals and minerals.Face Centered Cubic (FCC)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
FCC-Crystal-Structure-of-Lead.jpg#100   
Radius of an Atom
  
  
Atomic Radius
128.00 pm   
99+
175.00 pm   
19
Covalent Radius
139.00 pm   
99+
146.00 pm   
38
Van der Waals Radius
200.00 pm   
28
202.00 pm   
27
Lattice Constant
291.00 pm   
99+
495.08 pm   
16
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Adjacent Atomic Numbers
  
  
Next Element
Manganese
  
Bismuth
  
Previous Element
Vanadium
  
Thallium
  
Magnetic Properties
Electrical Properties
  
  
Resistivity
125.00 nΩ·m   
27
208.00 nΩ·m   
16
Electrical Conductivity
0.08 106/cm Ω   
25
0.05 106/cm Ω   
36
Electron Affinity
64.30 kJ/mol   
15
35.10 kJ/mol   
28
Electrical Property
NA   
?
Poor conductor metals have moderate resistance to electric currents. They can conduct electric current through them with very low efficiency.Poor Conductor   
Magnetic Characteristics
  
  
Specific Gravity
7.19   
99+
11.35   
25
Magnetic Ordering
?
Antiferromagnetic metals denote or exhibit a form of magnetism characterized by an anti-parallel alignment of adjacent electron spins in a crystal lattice.Antiferromagnetic   
?
Diamagnetic metals produce a magnetic field opposite to the applied magnetic field. Thus, they are repelled by magnets and show magnetic nature.Diamagnetic   
Permeability
Not Available   
Not Available   
Susceptibility
Not Available   
Not Available   
Thermal Properties
Specific Heat
0.45 J/(kg K)   
12
0.13 J/(kg K)   
39
Thermal Conductivity
93.90 W/m·K   
17
35.30 W/m·K   
38
Critical Temperature
Not Available   
Not Available   
Molar Heat Capacity
23.35 J/mol·K   
99+
26.65 J/mol·K   
26
Thermal Expansion
4.90 µm/(m·K)   
99+
28.90 µm/(m·K)   
13
Standard Molar Entropy
23.80 J/mol.K   
99+
64.80 J/mol.K   
17
Enthalpy
  
  
Enthalpy of Vaporization
348.80 kJ/mol   
24
179.40 kJ/mol   
99+
Enthalpy of Fusion
15.31 kJ/mol   
20
4.77 kJ/mol   
99+
Enthalpy of Atomization
397.50 kJ/mol   
21
194.60 kJ/mol   
99+
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