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The shared property of electron and proton that belongs in the region marked "B” is the presence of charge on both of them.

What charge is present on proton and electron?

We know that proton is positively charge particle while on the other hand, electron is negatively charge particle. Due to opposite charges, these particles attract each other.

So we can conclude that the shared property of electron and proton that belongs in the region marked "B” is the presence of charge on both of them.

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