Lanthanum

Iridium

Atomic Structure of Lanthanum and Iridium

Lanthanum

Iridium

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Atomic

Atomic Number

5777

3 117

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Electron Configuration

[Xe] 5d² 6s²

[Xe] 4f¹⁴ 5d⁷ 6s²

Crystal Structure

Double Hexagonal Close Packed (DHCP)

Face Centered Cubic (FCC)

Crystal Lattice

Atom

Number of Protons

5774

3 117

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Number of Neutrons

82110

4 285

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Number of Electrons

5774

3 117

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Radius of an Atom

Atomic Radius

187.00 pm136.00 pm

0 348

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Covalent Radius

207.00 pm141.00 pm

0 260

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Van der Waals Radius

240.00 pm202.00 pm

0 348

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Atomic Weight

138.91 amu192.22 amu

6.94 294

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Atomic Volume

20.73 cm3/mol9.53 cm3/mol

1.39 71.07

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Adjacent Atomic Numbers

Previous Element

Next Element

Valence Electron Potential

40.71 (-eV)140.00 (-eV)

0 392.42

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Lattice Constant

377.20 pm383.90 pm

0 891.25

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Lattice Angles

π/2, π/2, 2 π/3

π/2, π/2, π/2

Lattice C/A Ratio

1.621.58

0.423 1.9

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