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Gadolinium vs Americium

Gadolinium
Americium
Americium vs Gadolinium


Periodic Table
Symbol
Gd  
Am  
Group Number
0  
18
10  
8
Period Number
6  
7  
Block
f block  
f block  
Element Family
Lanthanide  
Actinide  
CAS Number
7440542  
33
7440359  
99+
Space Group Name
P63/mmc  
P63/mmc  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Gadolinium is not found free in nature, hence it is not a native metal.
  • Gadolinium metal found in minerals like Monazite and Bastnaesite.
  
  • Americium metal is produced by bombarding Plutonium with Neutrons.
  • Americium metal was discovered as a by-product while testing an atomic bomb (Manhattan Project).
  
Sources
Found in Minerals, Mining  
Obtained By Bombarding Plutonium with Neutrons  
History
  
  
Who Discovered
Jean Charles Galissard de Marignac  
Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso  
Discovery
In 1880  
In 1944  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
35
Abundance In Sun
0.00 %  
25
0.00 %  
30
Abundance In Meteorites
0.00 %  
34
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
30
0.00 %  
99+
Abundance In Oceans
0.00 %  
38
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Its alloys are also used in making Magnets, electronic components and Data storage devices.
  • Compound of Gadolinium metal are used in magnetic resonance imaging (MRI).
  
  • Americium metal is used in smoke detection alarms.
  • In the future, this metal has a potential to be used in batteries of spacecrafts.
  
Industrial Uses
Aerospace Industry, Electrical Industry, Electronic Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
Non Toxic  
Toxic  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,311.00 °C  
35
994.00 °C  
99+
Boiling Point
3,233.00 °C  
26
2,607.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Metallic  
-  
Hardness
  
  
Mohs Hardness
4.50  
10
6.00  
6
Brinell Hardness
700.00 MPa  
17
260.00 MPa  
99+
Vickers Hardness
510.00 MPa  
34
600.00 MPa  
28
Speed of Sound
2,680.00 m/s  
99+
2,750.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.97  
16
1.30  
99+
Reflectivity
59.00 %  
24
64.00 %  
19
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Gd  
Am  
Isotopes
  
  
Known Isotopes
26  
13
16  
23
Electronegativity
  
  
Pauling Electronegativity
1.20  
40
1.30  
33
Sanderson Electronegativity
1.20  
32
1.30  
25
Allred Rochow Electronegativity
1.11  
30
1.20  
28
Mulliken-Jaffe Electronegativity
1.20  
39
1.30  
33
Allen Electronegativity
1.20  
99+
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.80  
15
2.70  
22
Ionization Energies
  
  
1st Energy Level
593.40 kJ/mol  
99+
578.00 kJ/mol  
99+
2nd Energy Level
1,170.00 kJ/mol  
99+
1,158.00 kJ/mol  
99+
3rd Energy Level
1,990.00 kJ/mol  
99+
2,132.00 kJ/mol  
99+
4th Energy Level
4,250.00 kJ/mol  
40
3,493.00 kJ/mol  
99+
5th Energy Level
5,930.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
6th Energy Level
5,930.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
7th Energy level
5,930.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
8th Energy Level
5,930.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
9th Energy Level
5,930.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
10th Energy Level
5,930.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
11th Energy Level
5,930.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
12th Energy Level
59,300.00 kJ/mol  
17
62,400.00 kJ/mol  
11
13th Energy Level
5,930.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
14th Energy Level
5,930.00 kJ/mol  
36
5,780.00 kJ/mol  
99+
15th Energy Level
59,300.00 kJ/mol  
99+
62,400.00 kJ/mol  
39
16th Energy Level
59,300.00 kJ/mol  
37
57,800.00 kJ/mol  
99+
17th Energy Level
594.10 kJ/mol  
99+
578.00 kJ/mol  
99+
18th Energy Level
5,930.00 kJ/mol  
99+
5,780.00 kJ/mol  
99+
19th Energy Level
593.40 kJ/mol  
99+
578.00 kJ/mol  
99+
20th Energy Level
594.00 kJ/mol  
99+
578.00 kJ/mol  
99+
21st Energy Level
593.40 kJ/mol  
99+
5,780.00 kJ/mol  
22
22nd Energy Level
593.00 kJ/mol  
99+
578.00 kJ/mol  
99+
23rd Energy Level
593.40 kJ/mol  
99+
5,780.00 kJ/mol  
23
24th Energy Level
593.40 kJ/mol  
99+
578.00 kJ/mol  
99+
25th Energy Level
593.00 kJ/mol  
99+
578.00 kJ/mol  
99+
26th Energy Level
593.40 kJ/mol  
99+
578.00 kJ/mol  
99+
27th Energy Level
593.40 kJ/mol  
99+
578.00 kJ/mol  
99+
28th Energy Level
593.40 kJ/mol  
99+
578.00 kJ/mol  
99+
29th Energy Level
593.40 kJ/mol  
99+
578.00 kJ/mol  
99+
30th Energy Level
593.40 kJ/mol  
99+
578.00 kJ/mol  
99+
Electrochemical Equivalent
1.96 g/amp-hr  
36
3.02 g/amp-hr  
20
Electron Work Function
3.10 eV  
99+
4.30 eV  
25
Other Chemical Properties
Corrosion, Flammable, Ionization, Radioactive Isotopes  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
64  
99+
95  
23
Electron Configuration
[Xe] 4f7 5d1 6s2  
[Rn] 5f7 7s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Double Hexagonal Close Packed (DHCP)  
Crystal Lattice
HCP-Crystal-Structure-of-Gadolinium.jpg#100  
DHCP-Crystal-Structure-of-Americium.jpg#100  
Atom
  
  
Number of Protons
64  
99+
95  
23
Number of Neutrons
93  
38
148  
13
Number of Electrons
64  
99+
95  
23
Radius of an Atom
  
  
Atomic Radius
180.00 pm  
16
173.00 pm  
23
Covalent Radius
196.00 pm  
14
180.00 pm  
23
Van der Waals Radius
237.00 pm  
19
244.00 pm  
14
Atomic Weight
47.87 amu  
99+
243.00 amu  
20
Atomic Volume
19.90 cm3/mol  
32
17.86 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Europium
  
Plutonium
  
Next Element
Terbium
  
Curium
  
Valence Electron Potential
46.10 (-eV)  
35
44.00 (-eV)  
99+
Lattice Constant
363.60 pm  
35
346.81 pm  
99+
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.59  
29
1.58  
34
Mechanical
Density
  
  
Density At Room Temperature
7.90 g/cm3  
99+
12.00 g/cm3  
32
Density When Liquid (at m.p.)
7.40 g/cm3  
99+
13.67 g/cm3  
26
Tensile Strength
158.00 MPa  
23
80.00 MPa  
29
Viscosity
0.00  
23
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
32
0.00 (Pa)  
13
Vapor Pressure at 2000 K
7.39 (Pa)  
9
0.00 (Pa)  
24
Elasticity properties
  
  
Shear Modulus
21.80 GPa  
99+
26.00 GPa  
36
Bulk Modulus
37.90 GPa  
99+
44.00 GPa  
32
Young's Modulus
54.80 GPa  
38
58.00 GPa  
36
Poisson Ratio
0.26  
23
0.30  
14
Other Mechanical Properties
Ductile, Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
7.90  
99+
13.67  
26
Magnetic Ordering
Ferromagnetic  
Paramagnetic  
Permeability
0.00 H/m  
12
0.00 H/m  
16
Susceptibility
0.00  
4
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
1.31 nΩ·m  
99+
0.69 nΩ·m  
99+
Electrical Conductivity
0.01 106/cm Ω  
99+
0.02 106/cm Ω  
99+
Electron Affinity
50.00 kJ/mol  
26
63.90 kJ/mol  
18
Thermal
Specific Heat
0.23 J/(kg K)  
27
0.11 J/(kg K)  
99+
Molar Heat Capacity
37.03 J/mol·K  
3
62.70 J/mol·K  
1
Thermal Conductivity
10.60 W/m·K  
99+
10.00 W/m·K  
99+
Critical Temperature
1,585.00 K  
38
1,449.00 K  
99+
Thermal Expansion
9.40 µm/(m·K)  
99+
13.60 µm/(m·K)  
32
Enthalpy
  
  
Enthalpy of Vaporization
359.40 kJ/mol  
30
161.00 kJ/mol  
99+
Enthalpy of Fusion
10.05 kJ/mol  
99+
14.39 kJ/mol  
27
Enthalpy of Atomization
352.00 kJ/mol  
36
268.00 kJ/mol  
99+
Standard Molar Entropy
68.10 J/mol.K  
16
63.10 J/mol.K  
23
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