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Lanthanum

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Roentgenium

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Lanthanum

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Roentgenium

Physical Properties of Lanthanum and Roentgenium

Lanthanum Metal

Lanthanum

Roentgenium Metal

Roentgenium

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1 Physical

1.1 Melting Point

920.00 °CNA

27 3410

1.2 Boiling Point

3,469.00 °CNA

147 5660

1.3 Appearance

1.3.1 Physical State

Solid

Solid

1.3.2 Color

Silvery White

Silver

1.3.3 Luster

NA

Unknown Luster

1.4 Hardness

1.4.1 Mohs Hardness

2.50NA

0.2 8.5

1.4.2 Brinell Hardness

350.00 MPaNA

0.14 3490

1.4.3 Vickers Hardness

360.00 MPaNA

121 3430

1.5 Speed of Sound

2,475.00 m/sNA

818 16200

1.6 Optical Properties

1.6.1 Refractive Index

NANA

1.000933 1.7229

1.6.2 Reflectivity

NANA

58 97

1.7 Allotropes

✔ ✘

✔ ✘

1.7.1 α Allotropes

Not Available

Not Available

1.7.2 β Allotropes

Not Available

Not Available

1.7.3 γ Allotropes

Not Available

Not Available

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