Symbol
Cd
  
Au
  
Period Number
5
  
6
  
Block
d block
  
d block
  
Element Family
Transition Metal
  
Transition Metal
  
Space Group Name
P63/mmc
  
Fm_ 3m
  
Interesting Facts
- Naturally occurring minor elements include Cadmium.
- Cadmium is released into atmosphere to control volcanic eruption and forest fires.
- It is used for electroplating of Steel for corrosion resistance.
- It can absorb neutrons and used in nuclear reactor to control atomic fission.
  
- It is found in copper ores and from the crust of the earth.
- It is the most malleable and ductile metal.
- Gold alloys are used in Dentistry as fillings, crowning, clips, etc. It is also used as an artificial limb joints.
  
Sources
Found As a By-product, Found in Minerals, Mining
  
Earth's crust, Mining, Ores of metals
  
History
  
  
Who Discovered
Karl Samuel Leberecht Hermann and Friedrich Stromeyer
  
Unknown
  
Discovery
In 1817
  
Before 6000 BCE
  
Abundance
  
  
Abundance In Sun
~0.0000006 %
  
21
~0.0000001 %
  
26
Abundance In Earth's Crust
Uses & Benefits
- It has very limited uses as it is a toxic metal and it can cause birth defects, cancer, etc.
-
Almost 80% of Cadmium metal is used in Nickel cadmium Batteries and now it is getting replaced with nickel hydride.
  
- Gold metal is mainly used for Jewelry, bullion, coinage, etc.
- It is used in the art, decoration, ornaments, etc. It is also used for electroplating process.
  
Industrial Uses
Aerospace Industry, Ammunition Industry, Chemical Industry, Electrical Industry, Electronic Industry
  
Chemical Industry, Clothing Industry, Electrical Industry, Electronic Industry
  
Medical Uses
NA
  
Dentistry, Pharmaceutical Industry
  
Other Uses
Alloys
  
Alloys, Bullion, Coinage, Jewellery, Sculptures, Statues
  
Biological Properties
  
  
Toxicity
Toxic
  
Non Toxic
  
Present in Human Body
Yes
  
Yes
  
In Blood
0.01 Blood/mg dm-3
  
24
0.00 Blood/mg dm-3
  
35
In Bone
1.80 p.p.m.
  
15
0.02 p.p.m.
  
30
Melting Point
1,064.43 °C
  
99+
Boiling Point
2,807.00 °C
  
36
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Silvery Bluish-Gray
  
Gold
  
Luster
Metallic
  
Metallic
  
Hardness
  
  
Brinell Hardness
194.00 MPa
  
99+
Vickers Hardness
Not Available
  
Speed of Sound
2,310.00 m/s
  
39
2,030.00 m/s
  
99+
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
Cd
  
Au
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
867.80 kJ/mol
  
11
890.10 kJ/mol
  
8
2nd Energy Level
1,631.40 kJ/mol
  
32
1,980.00 kJ/mol
  
12
3rd Energy Level
3,616.00 kJ/mol
  
13
Not Available
  
Electrochemical Equivalent
2.10 g/amp-hr
  
27
2.45 g/amp-hr
  
21
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility
  
Chemical Stability, Ionization, Solubility
  
Electron Configuration
[Kr] 4d10 5s2
  
[Xe] 4f14 5d10 6s1
  
Crystal Structure
Hexagonal Close Packed (HCP)
  
Face Centered Cubic (FCC)
  
Crystal Lattice
HCP-Crystal-Structure-of-Cadmium.jpg#100
  
FCC-Crystal-Structure-of-Gold.jpg#100
  
Atom
  
  
Radius of an Atom
  
  
Atomic Weight
112.41 amu
  
99+
Atomic Volume
13.10 cm3/mol
  
39
10.20 cm3/mol
  
99+
Adjacent Atomic Numbers
  
  
Valence Electron Potential
30.00 (-eV)
  
99+
43.40 (-eV)
  
99+
Lattice Angles
π/2, π/2, 2 π/3
  
π/2, π/2, π/2
  
Density
  
  
Density At Room Temperature
8.65 g/cm3
  
99+
19.30 g/cm3
  
15
Density When Liquid (at m.p.)
Viscosity
Not Available
  
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Vapor Pressure at 2000 K
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
Ductile, Malleable
  
Ductile, Malleable
  
Magnetic Characteristics
  
  
Magnetic Ordering
Diamagnetic
  
Diamagnetic
  
Electrical Properties
  
  
Electrical Property
Semiconductor
  
Conductor
  
Electrical Conductivity
0.14 106/cm Ω
  
15
0.45 106/cm Ω
  
3
Electron Affinity
0.00 kJ/mol
  
40
222.80 kJ/mol
  
1
Specific Heat
0.23 J/(kg K)
  
26
0.13 J/(kg K)
  
39
Molar Heat Capacity
26.02 J/mol·K
  
32
25.42 J/mol·K
  
40
Thermal Conductivity
96.60 W/m·K
  
16
318.00 W/m·K
  
3
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
30.80 µm/(m·K)
  
10
14.20 µm/(m·K)
  
26
Enthalpy
  
  
Enthalpy of Vaporization
100.00 kJ/mol
  
99+
324.40 kJ/mol
  
27
Enthalpy of Fusion
6.19 kJ/mol
  
99+
12.55 kJ/mol
  
27
Enthalpy of Atomization
113.00 kJ/mol
  
99+
364.00 kJ/mol
  
25
Standard Molar Entropy
51.80 J/mol.K
  
27
47.40 J/mol.K
  
32