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Atomic Number:99
Atomic Mass: 252
Standard State:solid
Group name:Actinoid
Period in Periodic Table:
Color:unknown, but probably metallic and silvery white or grey in appearance
ClassificatSymbol:ion: Metallic

This table of abundances, values are given in units of ppb (parts per billion; 1 billion = 109), both in terms of weight and in terms of numbers of atoms. Values for abundances are difficult to determine with certainty, so all values should be treated with some caution, especially so for the less common elements.