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Thulium
Thulium

Samarium
Samarium



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Thulium
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Samarium

Atomic Structure of Thulium and Samarium

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Atomic

Atomic Number

6962
3 117
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Electron Configuration

[Xe] 4f13 6s2
[Xe] 4f6 6s2

Crystal Structure

Hexagonal Close Packed (HCP)
Rhombohedral (RHO)

Crystal Lattice

Atom

Number of Protons

6962
3 117
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Number of Neutrons

10088
4 285
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Number of Electrons

6962
3 117
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Radius of an Atom

Atomic Radius

176.00 pm180.00 pm
0 348
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Covalent Radius

160.00 pm198.00 pm
0 260
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Van der Waals Radius

227.00 pm229.00 pm
0 348
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Atomic Weight

168.93 amu150.36 amu
6.94 294
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Atomic Volume

18.10 cm3/mol19.95 cm3/mol
1.39 71.07
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Adjacent Atomic Numbers

Previous Element

Next Element

Valence Electron Potential

49.70 (-eV)44.80 (-eV)
0 392.42
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Lattice Constant

353.75 pm362.10 pm
0 891.25
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Lattice Angles

π/2, π/2, 2 π/3
π/2, π/2, 2 π/3

Lattice C/A Ratio

1.571.62
0.423 1.9
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