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Atomic heatatomic mass
atomic mass unit
atomic number
atomic number 1
atomic number 10
atomic number 100
atomic number 101
atomic number 102
atomic number 103
atomic number 104
atomic number 105
atomic number 106
atomic number 107
atomic number 11
atomic number 12
-- atomic number 13 --
atomic number 14
atomic number 15
atomic number 16
atomic number 17
atomic number 18
atomic number 19
atomic number 2
atomic number 20
atomic number 21
atomic number 22
atomic number 23
atomic number 24
atomic number 25
atomic number 26
atomic number 27
atomic number 28
atomic number 13
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| Noun | 1. |  atomic number 13 - a silvery ductile metallic element found primarily in bauxite |