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Zirconium vs Actinium

Zirconium
Actinium
Actinium vs Zirconium


Periodic Table
Symbol
Zr  
Ac  
Group Number
4  
14
3  
15
Period Number
5  
7  
Block
d block  
f block  
Element Family
Transition Metal  
Actinide  
CAS Number
7440677  
23
7440348  
99+
Space Group Name
P63/mmc  
Fm_ 3m  
Space Group Number
194.00  
7
225.00  
3
Facts
Interesting Facts
  • Zirconium metal can resist to weak acids.
  • Zirconium metal reacts with oxygen and nitrogen in the atmosphere.
  
Actinium glows in the dark due to its radioactivity.  
Sources
Found in Minerals, Mining, Ores of Minerals  
Obtained by Treating Radium with Neutrons, Ores of metals  
History
  
  
Who Discovered
Martin Heinrich Klaproth  
Friedrich Oskar Giesel  
Discovery
In 1789  
In 1902  
Abundance
  
  
Abundance In Universe
0.00 %  
14
0.00 %  
34
Abundance In Sun
0.00 %  
16
0.00 %  
26
Abundance In Meteorites
0.00 %  
17
0.00 %  
99+
Abundance In Earth's Crust
0.01 %  
14
0.00 %  
99+
Abundance In Oceans
0.00 %  
23
0.00 %  
99+
Abundance In Humans
0.00 %  
18
0.00 %  
24
Uses
Uses & Benefits
  • As this metal does not absorb neutrons; It is used in nuclear power stations.
  • Its oxide is used in ultra strong ceramics. It is also used in manufacturing Crucibles.
  
  • Actinium metal has a great source of alpha rays but it is hardly used outside research purpose.
  
Industrial Uses
Aerospace Industry, Ammunition Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys, Nuclear Research, Research Purposes  
Alloys, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
-  
Toxic  
Present in Human Body
Yes  
No  
In Blood
0.01 Blood/mg dm-3  
21
0.00 Blood/mg dm-3  
40
In Bone
0.10 p.p.m.  
28
0.00 p.p.m.  
99+
Physical
Melting Point
1,852.00 °C  
15
1,227.00 °C  
38
Boiling Point
4,377.00 °C  
11
3,200.00 °C  
27
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Lustrous  
-  
Hardness
  
  
Mohs Hardness
5.00  
8
6.50  
5
Brinell Hardness
638.00 MPa  
21
70.00 MPa  
99+
Vickers Hardness
820.00 MPa  
22
260.00 MPa  
99+
Speed of Sound
3,800.00 m/s  
27
3,430.00 m/s  
32
Optical Properties
  
  
Refractive Index
2.15  
10
1.00  
99+
Reflectivity
70.00 %  
13
62.00 %  
21
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Zr  
Ac  
Isotopes
  
  
Known Isotopes
24  
15
29  
10
Electronegativity
  
  
Pauling Electronegativity
1.33  
31
1.10  
99+
Sanderson Electronegativity
0.90  
99+
1.10  
38
Allred Rochow Electronegativity
1.22  
27
1.00  
37
Mulliken-Jaffe Electronegativity
1.33  
32
1.10  
99+
Allen Electronegativity
1.32  
39
1.10  
99+
Electropositivity
  
  
Pauling Electropositivity
2.67  
24
2.90  
10
Ionization Energies
  
  
1st Energy Level
640.10 kJ/mol  
99+
499.00 kJ/mol  
99+
2nd Energy Level
1,270.00 kJ/mol  
99+
1,170.00 kJ/mol  
99+
3rd Energy Level
2,218.00 kJ/mol  
99+
1,900.00 kJ/mol  
99+
4th Energy Level
3,313.00 kJ/mol  
99+
4,700.00 kJ/mol  
33
5th Energy Level
7,752.00 kJ/mol  
16
4,990.00 kJ/mol  
99+
6th Energy Level
9,500.00 kJ/mol  
21
5,750.00 kJ/mol  
99+
7th Energy level
6,400.00 kJ/mol  
99+
5,750.00 kJ/mol  
99+
8th Energy Level
6,400.00 kJ/mol  
99+
5,750.00 kJ/mol  
99+
9th Energy Level
6,400.00 kJ/mol  
40
4,990.00 kJ/mol  
99+
10th Energy Level
5,730.00 kJ/mol  
99+
4,990.00 kJ/mol  
99+
11th Energy Level
6,406.00 kJ/mol  
99+
4,990.00 kJ/mol  
99+
12th Energy Level
6,400.00 kJ/mol  
99+
49,900.00 kJ/mol  
21
13th Energy Level
6,400.00 kJ/mol  
36
4,990.00 kJ/mol  
99+
14th Energy Level
640.00 kJ/mol  
99+
4,990.00 kJ/mol  
99+
15th Energy Level
64,000.00 kJ/mol  
36
49,900.00 kJ/mol  
99+
16th Energy Level
64,000.00 kJ/mol  
27
49,900.00 kJ/mol  
99+
17th Energy Level
640.10 kJ/mol  
99+
499.00 kJ/mol  
99+
18th Energy Level
6,400.00 kJ/mol  
38
4,990.00 kJ/mol  
99+
19th Energy Level
640.00 kJ/mol  
99+
499.00 kJ/mol  
99+
20th Energy Level
640.00 kJ/mol  
39
499.00 kJ/mol  
99+
21st Energy Level
640.10 kJ/mol  
99+
4,990.00 kJ/mol  
25
22nd Energy Level
640.00 kJ/mol  
33
499.00 kJ/mol  
99+
23rd Energy Level
640.10 kJ/mol  
99+
4,990.00 kJ/mol  
29
24th Energy Level
640.00 kJ/mol  
35
499.00 kJ/mol  
99+
25th Energy Level
640.10 kJ/mol  
37
499.00 kJ/mol  
99+
26th Energy Level
640.10 kJ/mol  
36
499.00 kJ/mol  
99+
27th Energy Level
640.10 kJ/mol  
38
499.00 kJ/mol  
99+
28th Energy Level
640.10 kJ/mol  
99+
499.00 kJ/mol  
99+
29th Energy Level
640.10 kJ/mol  
99+
499.00 kJ/mol  
99+
30th Energy Level
640.10 kJ/mol  
39
499.00 kJ/mol  
99+
Electrochemical Equivalent
0.85 g/amp-hr  
99+
2.82 g/amp-hr  
22
Electron Work Function
4.05 eV  
34
4.38 eV  
23
Other Chemical Properties
Anti Corrosion, Flammable, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Radioactivity, Solubility  
Atomic
Atomic Number
40  
99+
89  
29
Electron Configuration
[Kr] 4d2 5s2  
[Rn] 6d1 7s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Face Centered Cubic (FCC)  
Crystal Lattice
HCP-Crystal-Structure-of-Zirconium.jpg#100  
FCC-Crystal-Structure-of-Actinium.jpg#100  
Atom
  
  
Number of Protons
40  
99+
89  
29
Number of Neutrons
51  
99+
138  
17
Number of Electrons
40  
99+
89  
29
Radius of an Atom
  
  
Atomic Radius
160.00 pm  
29
195.00 pm  
9
Covalent Radius
175.00 pm  
25
186.00 pm  
21
Van der Waals Radius
200.00 pm  
35
215.00 pm  
31
Atomic Weight
91.22 amu  
99+
227.00 amu  
25
Atomic Volume
14.10 cm3/mol  
99+
22.54 cm3/mol  
20
Adjacent Atomic Numbers
  
  
Previous Element
Yttrium
  
Radium
  
Next Element
Niobium
  
Thorium
  
Valence Electron Potential
80.00 (-eV)  
18
38.60 (-eV)  
99+
Lattice Constant
323.20 pm  
99+
567.00 pm  
9
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.59  
25
1.89  
2
Mechanical
Density
  
  
Density At Room Temperature
6.52 g/cm3  
99+
10.00 g/cm3  
40
Density When Liquid (at m.p.)
5.80 g/cm3  
99+
10.07 g/cm3  
40
Tensile Strength
330.00 MPa  
14
65.00 MPa  
33
Viscosity
0.00  
12
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
21
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
33.00 GPa  
23
25.00 GPa  
38
Bulk Modulus
91.10 GPa  
18
94.00 GPa  
17
Young's Modulus
88.00 GPa  
24
130.00 GPa  
16
Poisson Ratio
0.34  
10
0.34  
10
Other Mechanical Properties
Ductile, Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
6.51  
99+
10.07  
99+
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
421.00 nΩ·m  
11
5.20 nΩ·m  
99+
Electrical Conductivity
0.02 106/cm Ω  
99+
0.15 106/cm Ω  
13
Electron Affinity
41.10 kJ/mol  
32
33.20 kJ/mol  
34
Thermal
Specific Heat
0.27 J/(kg K)  
19
0.12 J/(kg K)  
99+
Molar Heat Capacity
25.36 J/mol·K  
99+
27.20 J/mol·K  
24
Thermal Conductivity
22.60 W/m·K  
99+
12.00 W/m·K  
99+
Critical Temperature
2,128.00 K  
17
1,323.00 K  
99+
Thermal Expansion
5.70 µm/(m·K)  
99+
12.10 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
581.60 kJ/mol  
11
120.00 kJ/mol  
99+
Enthalpy of Fusion
20.90 kJ/mol  
11
14.20 kJ/mol  
28
Enthalpy of Atomization
598.00 kJ/mol  
12
301.00 kJ/mol  
99+
Standard Molar Entropy
39.00 J/mol.K  
99+
56.50 J/mol.K  
33
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