What Would Happen if the Earth Was Shrunk to the Size of a Small Particle?

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If the Earth was to be shrunk to the size of a small particle (around the size of *10^-11m) how would the properties differ? (given that the mass remains constant)
How would the properties differ if the mass size ratio was the same?
If it was involved in an exothermic reaction (and us humans were on it.. well assuming we can somehow) would we feel cold?
 
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At that size it would be a black hole.
 
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