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Americium vs Strontium

Americium
Strontium
Strontium vs Americium


Periodic Table
Symbol
Am  
Sr  
Group Number
10  
8
2  
16
Period Number
7  
5  
Block
f block  
s block  
Element Family
Actinide  
Alkaline Earth  
CAS Number
7440359  
99+
7440246  
99+
Space Group Name
P63/mmc  
Fm_ 3m  
Space Group Number
194.00  
7
225.00  
3
Facts
Interesting Facts
  • Americium metal is produced by bombarding Plutonium with Neutrons.
  • Americium metal was discovered as a by-product while testing an atomic bomb (Manhattan Project).
  
  • Strontium element is softer than Calcium.
  • Silvery Strontium turns yellow, if exposed to air.
  
Sources
Obtained By Bombarding Plutonium with Neutrons  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso  
William Cruickshank  
Discovery
In 1944  
In 1787  
Abundance
  
  
Abundance In Universe
0.00 %  
35
0.00 %  
15
Abundance In Sun
0.00 %  
30
0.00 %  
15
Abundance In Meteorites
0.00 %  
99+
0.00 %  
15
Abundance In Earth's Crust
0.00 %  
99+
0.04 %  
10
Abundance In Oceans
-  
0.00 %  
4
Abundance In Humans
0.00 %  
24
0.00 %  
8
Uses
Uses & Benefits
  • Americium metal is used in smoke detection alarms.
  • In the future, this metal has a potential to be used in batteries of spacecrafts.
  
  • Strontium metal is used to producing ferrite magnets as well as refining zinc.
  • By-product of nuclear reactors called Strontium-90 is a radioactive isotope; it is absorbed by tissues and destroys bone marrow and cancer growth.
  
Industrial Uses
-  
Ammunition Industry, Chemical Industry  
Medical Uses
-  
-  
Other Uses
Alloys, Nuclear Research, Research Purposes  
Alloys  
Biological Properties
  
  
Toxicity
Toxic  
Non Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
40
0.03 Blood/mg dm-3  
19
In Bone
0.00 p.p.m.  
99+
140.00 p.p.m.  
7
Physical
Melting Point
994.00 °C  
99+
769.00 °C  
99+
Boiling Point
2,607.00 °C  
99+
1,384.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
1.50  
19
Brinell Hardness
260.00 MPa  
99+
110.00 MPa  
99+
Vickers Hardness
600.00 MPa  
28
15.00 MPa  
99+
Speed of Sound
2,750.00 m/s  
99+
4,170.00 m/s  
23
Optical Properties
  
  
Refractive Index
1.30  
99+
1.43  
39
Reflectivity
64.00 %  
19
65.00 %  
18
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Am  
Sr  
Isotopes
  
  
Known Isotopes
16  
23
27  
12
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
0.95  
99+
Sanderson Electronegativity
1.30  
25
0.72  
99+
Allred Rochow Electronegativity
1.20  
28
0.99  
38
Mulliken-Jaffe Electronegativity
1.30  
33
1.00  
99+
Allen Electronegativity
1.30  
40
0.96  
99+
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
3.05  
7
Ionization Energies
  
  
1st Energy Level
578.00 kJ/mol  
99+
549.50 kJ/mol  
99+
2nd Energy Level
1,158.00 kJ/mol  
99+
1,064.20 kJ/mol  
99+
3rd Energy Level
2,132.00 kJ/mol  
99+
4,138.00 kJ/mol  
10
4th Energy Level
3,493.00 kJ/mol  
99+
5,500.00 kJ/mol  
22
5th Energy Level
5,780.00 kJ/mol  
99+
6,910.00 kJ/mol  
30
6th Energy Level
5,780.00 kJ/mol  
99+
8,760.00 kJ/mol  
26
7th Energy level
5,780.00 kJ/mol  
99+
10,230.00 kJ/mol  
19
8th Energy Level
5,780.00 kJ/mol  
99+
11,800.00 kJ/mol  
19
9th Energy Level
5,780.00 kJ/mol  
99+
15,600.00 kJ/mol  
17
10th Energy Level
5,780.00 kJ/mol  
99+
17,100.00 kJ/mol  
19
11th Energy Level
5,780.00 kJ/mol  
99+
31,270.00 kJ/mol  
6
12th Energy Level
62,400.00 kJ/mol  
11
5,490.00 kJ/mol  
99+
13th Energy Level
5,780.00 kJ/mol  
99+
5,490.00 kJ/mol  
99+
14th Energy Level
5,780.00 kJ/mol  
99+
5,490.00 kJ/mol  
99+
15th Energy Level
62,400.00 kJ/mol  
39
54,900.00 kJ/mol  
99+
16th Energy Level
57,800.00 kJ/mol  
99+
54,900.00 kJ/mol  
99+
17th Energy Level
578.00 kJ/mol  
99+
549.50 kJ/mol  
99+
18th Energy Level
5,780.00 kJ/mol  
99+
5,490.00 kJ/mol  
99+
19th Energy Level
578.00 kJ/mol  
99+
549.50 kJ/mol  
99+
20th Energy Level
578.00 kJ/mol  
99+
549.00 kJ/mol  
99+
21st Energy Level
5,780.00 kJ/mol  
22
549.50 kJ/mol  
99+
22nd Energy Level
578.00 kJ/mol  
99+
549.00 kJ/mol  
99+
23rd Energy Level
5,780.00 kJ/mol  
23
549.50 kJ/mol  
99+
24th Energy Level
578.00 kJ/mol  
99+
549.50 kJ/mol  
99+
25th Energy Level
578.00 kJ/mol  
99+
549.00 kJ/mol  
99+
26th Energy Level
578.00 kJ/mol  
99+
549.50 kJ/mol  
99+
27th Energy Level
578.00 kJ/mol  
99+
549.50 kJ/mol  
99+
28th Energy Level
578.00 kJ/mol  
99+
549.50 kJ/mol  
99+
29th Energy Level
578.00 kJ/mol  
99+
549.50 kJ/mol  
99+
30th Energy Level
578.00 kJ/mol  
99+
549.50 kJ/mol  
99+
Electrochemical Equivalent
3.02 g/amp-hr  
20
1.64 g/amp-hr  
99+
Electron Work Function
4.30 eV  
25
2.59 eV  
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
95  
23
38  
99+
Electron Configuration
[Rn] 5f7 7s2  
[Kr] 5s2  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Face Centered Cubic (FCC)  
Crystal Lattice
DHCP-Crystal-Structure-of-Americium.jpg#100  
FCC-Crystal-Structure-of-Strontium.jpg#100  
Atom
  
  
Number of Protons
95  
23
38  
99+
Number of Neutrons
148  
13
50  
99+
Number of Electrons
95  
23
38  
99+
Radius of an Atom
  
  
Atomic Radius
173.00 pm  
23
215.00 pm  
6
Covalent Radius
180.00 pm  
23
195.00 pm  
15
Van der Waals Radius
244.00 pm  
14
249.00 pm  
11
Atomic Weight
243.00 amu  
20
87.62 amu  
99+
Atomic Volume
17.86 cm3/mol  
99+
33.70 cm3/mol  
9
Adjacent Atomic Numbers
  
  
Previous Element
Plutonium
  
Rubidium
  
Next Element
Curium
  
Yttrium
  
Valence Electron Potential
44.00 (-eV)  
99+
25.70 (-eV)  
99+
Lattice Constant
346.81 pm  
99+
608.49 pm  
6
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.58  
34
1.57  
40
Mechanical
Density
  
  
Density At Room Temperature
12.00 g/cm3  
32
2.64 g/cm3  
99+
Density When Liquid (at m.p.)
13.67 g/cm3  
26
2.38 g/cm3  
99+
Tensile Strength
80.00 MPa  
29
170.00 MPa  
21
Viscosity
0.00  
25
0.00  
2
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
13
121.00 (Pa)  
1
Vapor Pressure at 2000 K
0.00 (Pa)  
24
0.00 (Pa)  
38
Elasticity properties
  
  
Shear Modulus
26.00 GPa  
36
6.03 GPa  
99+
Bulk Modulus
44.00 GPa  
32
11.00 GPa  
99+
Young's Modulus
58.00 GPa  
36
15.70 GPa  
99+
Poisson Ratio
0.30  
14
0.28  
17
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
13.67  
26
2.64  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
16
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
35
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
0.69 nΩ·m  
99+
132.00 nΩ·m  
24
Electrical Conductivity
0.02 106/cm Ω  
99+
0.08 106/cm Ω  
31
Electron Affinity
63.90 kJ/mol  
18
5.03 kJ/mol  
99+
Thermal
Specific Heat
0.11 J/(kg K)  
99+
0.30 J/(kg K)  
18
Molar Heat Capacity
62.70 J/mol·K  
1
26.40 J/mol·K  
36
Thermal Conductivity
10.00 W/m·K  
99+
35.40 W/m·K  
38
Critical Temperature
1,449.00 K  
99+
1,050.00 K  
99+
Thermal Expansion
13.60 µm/(m·K)  
32
22.50 µm/(m·K)  
19
Enthalpy
  
  
Enthalpy of Vaporization
161.00 kJ/mol  
99+
150.00 kJ/mol  
99+
Enthalpy of Fusion
14.39 kJ/mol  
27
9.16 kJ/mol  
99+
Enthalpy of Atomization
268.00 kJ/mol  
99+
163.20 kJ/mol  
99+
Standard Molar Entropy
63.10 J/mol.K  
23
55.00 J/mol.K  
34
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