eli5: Why are atomic bombs so dangerous?

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Usually atomic bombs are composed of Uranium-235, Uranium-238, and Plutonium (if I am wrong, please correct me), all of which have an alpha decay. However, if alpha particles have the least penetrating power, and can be stopped through something a thin as a piece of paper, how is it so dangerous?

edit: Sorry for the confusion, I meant how is the radiation from it dangerous, not the initial explosion. However it seems my question has been answered on both accounts. Thank you to everyone who answered! I have a better understanding of it now.

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Anonymous 0 Comments

The majority of the damage caused by an atomic bomb has nothing to do with the radiation, it’s the energy involved.

E=MC^2 a tiny amount of mass converted into energy is A LOT of energy

A nuclear blast releases a lot of heat and produces a shock wave that can destroy buildings, and vaporize steel let alone what it does to humans.

People who survive a nuclear blast then have to deal with severe burns, possible blindness, and radiation exposure.

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