Thorium
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Heat of Combustion:
Spontaneously when exposed to air.
Half-Life:
Between 25.52 hours~14 billion years
Reaction with acid:
Does not easily dissolve, except for Hydrochloric acid.
Chemical Stability:
Unstable---applies to all 6 isotopes: Thorium 227, 228, 230, 231, 232, 234)