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Uranium 235 has 92 protons and 92 electrons.

To find the number of neutrons, follow this equation:

Mass # - Atomic # = # of neutrons.

Since the mass number of uranium 235 is 235 and has an atomic number of 92, the number of neutrons is 143.

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How many neutrons are in Element 92?

Element number 92 is Uranium and there are two main isotopes - U235 and U238. In U235 there are 92 protons so there are 235 - 92 = 143 neutrons. In U238 there are thus 146 neutrons


Why is large mass of uranium-235 needed for a chain reaction?

Each time a U235 atom decays, it emits 2-3 neutrons. The likelihood that one of these neutrons is captured by another U235 atom INCREASES with more mass. The SHAPE of this mass will also play a role, imagine a thin wire of U235, compared to a sphere, with regards to how likely a chain reaction will occur. Neutron reflection can also help redirect an errant neutron back into the mass so it can react instead. Compression (increase of density) plays a role as well.


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The nucleus of the Uranium-235 (U235) atom participates in the nuclear reaction by absorbing a neutron (n) to form an unstable compound nucleus, which then undergoes fission into Xe134, Sr100, and two neutrons (2n).


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How many neutrons would it have if it had 11 neutrons? 11.


What can isotopes of the same elements have a different number of what?

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