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Thallium

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Lanthanum

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Thallium

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Lanthanum

Physical Properties of Thallium and Lanthanum

Thallium Metal

Thallium

Lanthanum Metal

Lanthanum

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1 Physical

1.1 Melting Point

303.50 °C920.00 °C

27 3410

1.2 Boiling Point

1,457.00 °C3,469.00 °C

147 5660

1.3 Appearance

1.3.1 Physical State

Solid

Solid

1.3.2 Color

Silvery White

Silvery White

1.3.3 Luster

NA

NA

1.4 Hardness

1.4.1 Mohs Hardness

1.202.50

0.2 8.5

1.4.2 Brinell Hardness

26.50 MPa350.00 MPa

0.14 3490

1.4.3 Vickers Hardness

NA360.00 MPa

121 3430

1.5 Speed of Sound

818.00 m/s2,475.00 m/s

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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