Posts about periodic table

Description

Thorium

Atomic Number: 90Atomic Mass: 232.038

Actinium

Atomic Number: 89Atomic Mass: 227

Thulium

Atomic Number: 69Atomic Mass: 168.93422

Erbium

Atomic Number: 68Atomic Mass: 167.259

Holmium

Atomic Number: 67Atomic Mass: 164.930

Terbium

Atomic Number: 65Atomic Mass: 158.92535

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