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Technetium vs Strontium

Technetium
Strontium
Strontium vs Technetium


Periodic Table
Symbol
Tc  
Sr  
Group Number
7  
11
2  
16
Period Number
5  
5  
Block
d block  
s block  
Element Family
Transition Metal  
Alkaline Earth  
CAS Number
7440268  
99+
7440246  
99+
Space Group Name
P63/mmc  
Fm_ 3m  
Space Group Number
194.00  
7
225.00  
3
Facts
Interesting Facts
  • Original name of Technetium was Masurium.
  • At the time of its discovery it found in sample of Molybdenum.
  
  • Strontium element is softer than Calcium.
  • Silvery Strontium turns yellow, if exposed to air.
  
Sources
Made by Bombarding Molybdenum with Deuterons  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Emilio Segrè and Carlo Perriero  
William Cruickshank  
Discovery
In 1937  
In 1787  
Abundance
  
  
Abundance In Universe
0.00 %  
40
0.00 %  
15
Abundance In Sun
0.00 %  
18
0.00 %  
15
Abundance In Meteorites
-  
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 %  
8
Uses
Uses & Benefits
  • Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
  
  • 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
Low 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
2,200.00 °C  
9
769.00 °C  
99+
Boiling Point
4,877.00 °C  
7
1,384.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Shiny Gray  
Silvery White  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
2.25  
16
1.50  
19
Brinell Hardness
550.00 MPa  
27
110.00 MPa  
99+
Vickers Hardness
500.00 MPa  
35
15.00 MPa  
99+
Speed of Sound
16,200.00 m/s  
1
4,170.00 m/s  
23
Optical Properties
  
  
Refractive Index
1.90  
18
1.43  
39
Reflectivity
35.00 %  
34
65.00 %  
18
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Tc  
Sr  
Isotopes
  
  
Known Isotopes
18  
21
27  
12
Electronegativity
  
  
Pauling Electronegativity
1.90  
12
0.95  
99+
Sanderson Electronegativity
1.90  
13
0.72  
99+
Allred Rochow Electronegativity
1.36  
21
0.99  
38
Mulliken-Jaffe Electronegativity
1.90  
13
1.00  
99+
Allen Electronegativity
1.51  
31
0.96  
99+
Electropositivity
  
  
Pauling Electropositivity
2.10  
99+
3.05  
7
Ionization Energies
  
  
1st Energy Level
702.00 kJ/mol  
36
549.50 kJ/mol  
99+
2nd Energy Level
1,470.00 kJ/mol  
99+
1,064.20 kJ/mol  
99+
3rd Energy Level
2,850.00 kJ/mol  
34
4,138.00 kJ/mol  
10
4th Energy Level
7,020.00 kJ/mol  
14
5,500.00 kJ/mol  
22
5th Energy Level
7,020.00 kJ/mol  
28
6,910.00 kJ/mol  
30
6th Energy Level
7,020.00 kJ/mol  
99+
8,760.00 kJ/mol  
26
7th Energy level
4,700.00 kJ/mol  
99+
10,230.00 kJ/mol  
19
8th Energy Level
4,700.00 kJ/mol  
99+
11,800.00 kJ/mol  
19
9th Energy Level
7,020.00 kJ/mol  
35
15,600.00 kJ/mol  
17
10th Energy Level
7,020.00 kJ/mol  
39
17,100.00 kJ/mol  
19
11th Energy Level
7,020.00 kJ/mol  
37
31,270.00 kJ/mol  
6
12th Energy Level
7,020.00 kJ/mol  
99+
5,490.00 kJ/mol  
99+
13th Energy Level
7,020.00 kJ/mol  
33
5,490.00 kJ/mol  
99+
14th Energy Level
7,020.00 kJ/mol  
23
5,490.00 kJ/mol  
99+
15th Energy Level
70,200.00 kJ/mol  
29
54,900.00 kJ/mol  
99+
16th Energy Level
70,200.00 kJ/mol  
24
54,900.00 kJ/mol  
99+
17th Energy Level
702.50 kJ/mol  
99+
549.50 kJ/mol  
99+
18th Energy Level
7,020.00 kJ/mol  
35
5,490.00 kJ/mol  
99+
19th Energy Level
702.00 kJ/mol  
99+
549.50 kJ/mol  
99+
20th Energy Level
702.00 kJ/mol  
35
549.00 kJ/mol  
99+
21st Energy Level
702.00 kJ/mol  
99+
549.50 kJ/mol  
99+
22nd Energy Level
702.00 kJ/mol  
29
549.00 kJ/mol  
99+
23rd Energy Level
702.00 kJ/mol  
99+
549.50 kJ/mol  
99+
24th Energy Level
702.50 kJ/mol  
28
549.50 kJ/mol  
99+
25th Energy Level
702.00 kJ/mol  
30
549.00 kJ/mol  
99+
26th Energy Level
702.00 kJ/mol  
29
549.50 kJ/mol  
99+
27th Energy Level
702.00 kJ/mol  
30
549.50 kJ/mol  
99+
28th Energy Level
702.00 kJ/mol  
35
549.50 kJ/mol  
99+
29th Energy Level
702.00 kJ/mol  
36
549.50 kJ/mol  
99+
30th Energy Level
702.00 kJ/mol  
30
549.50 kJ/mol  
99+
Electrochemical Equivalent
0.52 g/amp-hr  
99+
1.64 g/amp-hr  
99+
Electron Work Function
4.90 eV  
12
2.59 eV  
99+
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
43  
99+
38  
99+
Electron Configuration
[Kr] 4d5 5s2  
[Kr] 5s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Face Centered Cubic (FCC)  
Crystal Lattice
HCP-Crystal-Structure-of-Technetium.jpg#100  
FCC-Crystal-Structure-of-Strontium.jpg#100  
Atom
  
  
Number of Protons
43  
99+
38  
99+
Number of Neutrons
55  
99+
50  
99+
Number of Electrons
43  
99+
38  
99+
Radius of an Atom
  
  
Atomic Radius
136.00 pm  
99+
215.00 pm  
6
Covalent Radius
147.00 pm  
39
195.00 pm  
15
Van der Waals Radius
200.00 pm  
35
249.00 pm  
11
Atomic Weight
98.00 amu  
99+
87.62 amu  
99+
Atomic Volume
8.50 cm3/mol  
99+
33.70 cm3/mol  
9
Adjacent Atomic Numbers
  
  
Previous Element
Molybdenum
  
Rubidium
  
Next Element
Ruthenium
  
Yttrium
  
Valence Electron Potential
180.00 (-eV)  
3
25.70 (-eV)  
99+
Lattice Constant
273.50 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
1.60  
21
1.57  
40
Mechanical
Density
  
  
Density At Room Temperature
11.00 g/cm3  
36
2.64 g/cm3  
99+
Density When Liquid (at m.p.)
11.00 g/cm3  
34
2.38 g/cm3  
99+
Tensile Strength
50.00 MPa  
38
170.00 MPa  
21
Viscosity
0.00  
25
0.00  
2
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
121.00 (Pa)  
1
Vapor Pressure at 2000 K
0.00 (Pa)  
99+
0.00 (Pa)  
38
Elasticity properties
  
  
Shear Modulus
27.00 GPa  
34
6.03 GPa  
99+
Bulk Modulus
100.00 GPa  
16
11.00 GPa  
99+
Young's Modulus
50.00 GPa  
39
15.70 GPa  
99+
Poisson Ratio
0.38  
6
0.28  
17
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
11.50  
37
2.64  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
35
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
200.00 nΩ·m  
18
132.00 nΩ·m  
24
Electrical Conductivity
0.07 106/cm Ω  
35
0.08 106/cm Ω  
31
Electron Affinity
53.00 kJ/mol  
23
5.03 kJ/mol  
99+
Thermal
Specific Heat
0.21 J/(kg K)  
30
0.30 J/(kg K)  
18
Molar Heat Capacity
24.27 J/mol·K  
99+
26.40 J/mol·K  
36
Thermal Conductivity
50.60 W/m·K  
30
35.40 W/m·K  
38
Critical Temperature
2,150.00 K  
16
1,050.00 K  
99+
Thermal Expansion
7.10 µm/(m·K)  
99+
22.50 µm/(m·K)  
19
Enthalpy
  
  
Enthalpy of Vaporization
660.00 kJ/mol  
7
150.00 kJ/mol  
99+
Enthalpy of Fusion
23.01 kJ/mol  
9
9.16 kJ/mol  
99+
Enthalpy of Atomization
649.00 kJ/mol  
9
163.20 kJ/mol  
99+
Standard Molar Entropy
181.10 J/mol.K  
2
55.00 J/mol.K  
34
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