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Erbium

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Promethium

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Erbium

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Promethium

Physical Properties of Erbium and Promethium

Erbium Metal

Erbium

Promethium Electron Configuration

Promethium

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1 Physical

1.1 Melting Point

1,522.00 °C1,042.00 °C

27 3410

1.2 Boiling Point

2,510.00 °C3,000.00 °C

147 5660

1.3 Appearance

1.3.1 Physical State

Solid

Solid

1.3.2 Color

Silvery White

Unknown

1.3.3 Luster

Lustrous

Metallic

1.4 Hardness

1.4.1 Mohs Hardness

NANA

0.2 8.5

1.4.2 Brinell Hardness

814.00 MPaNA

0.14 3490

1.4.3 Vickers Hardness

589.00 MPaNA

121 3430

1.5 Speed of Sound

2,830.00 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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