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Noun: atomic number 90
- A soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands
- thorium, Th
Type of: metal, metallic element
Nearest
atomic number 81
atomic number 82
atomic number 83
atomic number 84
atomic number 85
atomic number 86
atomic number 87
atomic number 88
atomic number 89
atomic number 9
atomic number 90
atomic number 91
atomic number 92
atomic number 93
atomic number 94
atomic number 95
atomic number 96
atomic number 97
atomic number 98
atomic number 99
atomic physics
atomic number 82
atomic number 83
atomic number 84
atomic number 85
atomic number 86
atomic number 87
atomic number 88
atomic number 89
atomic number 9
atomic number 90
atomic number 91
atomic number 92
atomic number 93
atomic number 94
atomic number 95
atomic number 96
atomic number 97
atomic number 98
atomic number 99
atomic physics