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The atomic number of thorium is 90. So there are 90 protons and 90 electrons.

In Th-230 isotope there are 140 neutrons (230 - 90 = 140)

So there are 50 more neutrons than the number of protons.

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Q: How many more neutrons does thorium-230have than protons how many electrons does thorium-230 have?
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