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Potassium

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Sodium

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Potassium

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Physical Properties of Potassium and Sodium

Potassium Metal

Potassium

Sodium Metal

Sodium

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1 Physical

1.1 Melting Point

63.65 °C97.72 °C

27 3410

1.2 Boiling Point

774.00 °C883.00 °C

147 5660

1.3 Appearance

1.3.1 Physical State

Solid

Solid

1.3.2 Color

Silvery Gray

Silvery White

1.3.3 Luster

NA

Metallic

1.4 Hardness

1.4.1 Mohs Hardness

0.400.50

0.2 8.5

1.4.2 Brinell Hardness

0.36 MPa0.69 MPa

0.14 3490

1.4.3 Vickers Hardness

NANA

121 3430

1.5 Speed of Sound

2,000.00 m/s3,200.00 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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