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Thorium

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Protactinium

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Thorium

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Protactinium

Physical Properties of Thorium and Protactinium

Thorium Metal

Thorium

Protactinium Electron Configuration

Protactinium

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1 Physical

1.1 Melting Point

1,750.00 °C1,568.00 °C

27 3410

1.2 Boiling Point

4,790.00 °C4,027.00 °C

147 5660

1.3 Appearance

1.3.1 Physical State

Solid

Solid

1.3.2 Color

Silver

Silver

1.3.3 Luster

NA

Metallic

1.4 Hardness

1.4.1 Mohs Hardness

3.00NA

0.2 8.5

1.4.2 Brinell Hardness

390.00 MPaNA

0.14 3490

1.4.3 Vickers Hardness

295.00 MPaNA

121 3430

1.5 Speed of Sound

2,490.00 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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