Home
 Compare Metals

Californium vs Roentgenium

Californium
Roentgenium
Roentgenium vs Californium


Periodic Table
Symbol
Cf  
Rg  
Group Number
3  
15
11  
7
Period Number
7  
7  
Block
f block  
d block  
Element Family
Actinide  
-  
CAS Number
7440713  
20
54386242  
1
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Californium metal is very harmful and highly radioactive.
  • Californium metal is the heaviest metal.
  
Roentgenium is a highly unstable synthetic element.  
Sources
Made by Bombarding Curium with Helium Ions  
Synthetically Produced  
History
  
  
Who Discovered
Lawrence Berkeley National Laboratory  
Gesellschaft für Schwerionenforschung  
Discovery
In 1950  
In 1994  
Abundance
  
  
Abundance In Universe
0.00 %  
38
0.00 %  
40
Abundance In Sun
0.00 %  
30
-  
Abundance In Meteorites
0.00 %  
99+
-  
Abundance In Earth's Crust
0.00 %  
99+
-  
Abundance In Oceans
-  
-  
Abundance In Humans
0.00 %  
24
-  
Uses
Uses & Benefits
  • Californium metal has a very strong neutron emitter. It is used as a metal detector.
  • It also used as an identifier to check Water and oil layers in oil wells.
  
  • Currently known uses of Roentgenium metal are limited to research purpose only.
  
Industrial Uses
Chemical Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys, Nuclear Research  
Research Purposes  
Biological Properties
  
  
Toxicity
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
900.00 °C  
99+
-  
Boiling Point
1,470.00 °C  
99+
2,800.00 °C  
38
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Silver  
Luster
-  
Unknown Luster  
Hardness
  
  
Mohs Hardness
3.00  
13
-  
Brinell Hardness
170.00 MPa  
99+
700.00 MPa  
17
Vickers Hardness
1,800.00 MPa  
7
450.00 MPa  
38
Speed of Sound
2,260.00 m/s  
99+
3,430.00 m/s  
32
Optical Properties
  
  
Refractive Index
1.30  
99+
1.30  
99+
Reflectivity
63.00 %  
20
64.00 %  
19
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Cf  
Rg  
Isotopes
  
  
Known Isotopes
20  
19
1  
34
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
0.00  
99+
Sanderson Electronegativity
1.30  
25
1.90  
13
Allred Rochow Electronegativity
1.20  
28
1.30  
25
Mulliken-Jaffe Electronegativity
1.30  
33
0.90  
99+
Allen Electronegativity
1.30  
40
0.80  
99+
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.20  
39
Ionization Energies
  
  
1st Energy Level
608.00 kJ/mol  
99+
1,022.70 kJ/mol  
3
2nd Energy Level
1,206.00 kJ/mol  
99+
2,074.40 kJ/mol  
10
3rd Energy Level
2,267.00 kJ/mol  
99+
3,077.90 kJ/mol  
24
4th Energy Level
3,599.00 kJ/mol  
99+
4,052.40 kJ/mol  
99+
5th Energy Level
6,080.00 kJ/mol  
99+
5,306.70 kJ/mol  
99+
6th Energy Level
6,080.00 kJ/mol  
99+
11,100.00 kJ/mol  
10
7th Energy level
6,080.00 kJ/mol  
99+
5,800.00 kJ/mol  
99+
8th Energy Level
6,080.00 kJ/mol  
99+
5,800.00 kJ/mol  
99+
9th Energy Level
6,080.00 kJ/mol  
99+
5,650.00 kJ/mol  
99+
10th Energy Level
6,080.00 kJ/mol  
99+
5,800.00 kJ/mol  
99+
11th Energy Level
6,080.00 kJ/mol  
99+
8,300.00 kJ/mol  
24
12th Energy Level
60,800.00 kJ/mol  
14
8,300.00 kJ/mol  
99+
13th Energy Level
6,080.00 kJ/mol  
99+
8,700.00 kJ/mol  
16
14th Energy Level
6,080.00 kJ/mol  
30
8,300.00 kJ/mol  
16
15th Energy Level
62,400.00 kJ/mol  
39
87,000.00 kJ/mol  
9
16th Energy Level
62,400.00 kJ/mol  
29
83,000.00 kJ/mol  
11
17th Energy Level
608.00 kJ/mol  
99+
830.80 kJ/mol  
30
18th Energy Level
6,085.00 kJ/mol  
99+
8,300.00 kJ/mol  
19
19th Energy Level
608.00 kJ/mol  
99+
580.00 kJ/mol  
99+
20th Energy Level
578.00 kJ/mol  
99+
580.00 kJ/mol  
99+
21st Energy Level
6,080.00 kJ/mol  
16
5,800.00 kJ/mol  
21
22nd Energy Level
608.00 kJ/mol  
39
580.00 kJ/mol  
99+
23rd Energy Level
6,080.00 kJ/mol  
17
5,800.00 kJ/mol  
21
24th Energy Level
608.00 kJ/mol  
99+
538.70 kJ/mol  
99+
25th Energy Level
608.00 kJ/mol  
99+
0.00 kJ/mol  
99+
26th Energy Level
608.00 kJ/mol  
99+
580.00 kJ/mol  
99+
27th Energy Level
608.00 kJ/mol  
99+
580.00 kJ/mol  
99+
28th Energy Level
608.00 kJ/mol  
99+
880.00 kJ/mol  
8
29th Energy Level
608.00 kJ/mol  
99+
580.00 kJ/mol  
99+
30th Energy Level
608.00 kJ/mol  
99+
0.00 kJ/mol  
99+
Electrochemical Equivalent
3.12 g/amp-hr  
17
3.10 g/amp-hr  
18
Electron Work Function
4.70 eV  
15
4.90 eV  
12
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility  
-  
Atomic
Atomic Number
98  
20
111  
7
Electron Configuration
[Rn] 5f10 7s2  
[Rn] 5f14 6d9 7s2  
Crystal Structure
Double Hexagonal Close Packed (DHCP)  
Body Centered Cubic (BCC)  
Crystal Lattice
DHCP-Crystal-Structure-of-Californium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
98  
20
111  
7
Number of Neutrons
153  
10
161  
4
Number of Electrons
98  
20
111  
7
Radius of an Atom
  
  
Atomic Radius
186.00 pm  
11
200.00 pm  
7
Covalent Radius
186.00 pm  
21
126.00 pm  
99+
Van der Waals Radius
244.00 pm  
14
280.00 pm  
6
Atomic Weight
251.00 amu  
17
281.00 amu  
6
Atomic Volume
15.10 cm3/mol  
99+
28.70 cm3/mol  
12
Adjacent Atomic Numbers
  
  
Previous Element
Berkelium
  
Darmstadtium
  
Next Element
Einsteinium
  
Copernicium
  
Valence Electron Potential
44.50 (-eV)  
39
11.90 (-eV)  
99+
Lattice Constant
338.00 pm  
99+
0.00 pm  
99+
Lattice Angles
π/2, π/2, 2 π/3  
-  
Lattice C/A Ratio
1.58  
34
1.90  
1
Mechanical
Density
  
  
Density At Room Temperature
15.10 g/cm3  
21
28.70 g/cm3  
6
Density When Liquid (at m.p.)
15.10 g/cm3  
22
28.70 g/cm3  
7
Tensile Strength
50.00 MPa  
38
65.00 MPa  
33
Viscosity
0.00  
25
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
24
0.00 (Pa)  
99+
Elasticity properties
  
  
Shear Modulus
29.00 GPa  
29
26.00 GPa  
36
Bulk Modulus
40.00 GPa  
38
0.00 GPa  
99+
Young's Modulus
0.00 GPa  
99+
12.70 GPa  
99+
Poisson Ratio
0.30  
14
0.30  
14
Other Mechanical Properties
Malleable, Sectile  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
15.10  
24
28.70  
8
Magnetic Ordering
Paramagnetic  
-  
Permeability
0.00 H/m  
8
0.00 H/m  
12
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
-  
-  
Resistivity
6.20 nΩ·m  
99+
0.20 nΩ·m  
99+
Electrical Conductivity
0.11 106/cm Ω  
23
0.00 106/cm Ω  
99+
Electron Affinity
97.00 kJ/mol  
12
50.00 kJ/mol  
26
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.13 J/(kg K)  
40
Molar Heat Capacity
26.70 J/mol·K  
33
23.70 J/mol·K  
99+
Thermal Conductivity
10.00 W/m·K  
99+
0.10 W/m·K  
99+
Critical Temperature
900.00 K  
99+
1,100.00 K  
99+
Thermal Expansion
11.70 µm/(m·K)  
99+
12.60 µm/(m·K)  
40
Enthalpy
  
  
Enthalpy of Vaporization
311.40 kJ/mol  
99+
580.00 kJ/mol  
12
Enthalpy of Fusion
15.10 kJ/mol  
21
-  
Enthalpy of Atomization
-  
580.00 kJ/mol  
14
Standard Molar Entropy
50.00 J/mol.K  
99+
57.00 J/mol.K  
30
Periodic Table >>
<< All

Compare Actinide Series

Actinide Series

Actinide Series

» More Actinide Series

Compare Actinide Series

» More Compare Actinide Series
Home | About | Contact | Disclaimer | Terms of use
© A softusvista inc. venture!