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Thorium Th (Element 90) of Periodic Table

90 Th (Thorium) Appearance: Silvery, often with black tarnish Atomic weight: 232.0377 Atomic number (Z): 90 Electrons: 90 […]

91 Pa (Protactinium) Appearance: Bright, Silvery metallic luster Mass number: 231 Atomic weight: 231.03588(2) g/mol Atomic number (Z):

92 U Uranium Appearance: Silvery gray metallic Mass number: 238 Atomic weight: 238.02891 g/mol Atomic number (Z): 92

92 Np Neptunium Appearance: Silvery metallic Mass number: 237 Atomic weigth: 237.0482 g/mol Atomic number (Z): 93 Electrons:

94 Pu Plutonium Appearance: Silvery white, Tarnishing to dark gray in air Mass number: 244 Atomic weight: 244.0642

95 Am (Americium) Appearance – Silvery white, Shiny Mass number – 243 Atomic number (Z) – 95 Atomic

96 Cm (Curium) Appearance – Silvery metallic, glows purple in the dark (It tarnishes rapidly in air) Mass

97 Bk (Berkelium) Appearance – Silvery (Radioactive) Mass number – 247 Atomic weight – 247.0703 g/mol Atomic number

98 Cf (Californium) Appearance – Silvery (Radioactive metal) Mass number – 251 Atomic weight – 251.0796 g/mol Atomic

99 Es (Einsteinium) Appearance – Silvery; glows blue in the dark (Radioactive metal) Mass number – 252 Atomic

100 Fm (Fermium) Mass number – 257 Atomic weight – 257.0951 g/mol Atomic number (Z) – 100 Electrons:

101 Md (Mendelevium) Mass number – 258 Atomic weight – 258.0951 g/mol Atomic number (Z) – 101 Electrons: