The nucleus of deuterium, called a deuteron, contains:

one proton and no neutron

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one proton and one electron

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one proton and one neutron

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one proton and two neutron

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Solution

The correct option is D one proton and one neutron
The nucleus of deuterium, called a deuteron, contains one proton and one neutron, whereas the far more common hydrogen isotope, protium, has no neutron in the nucleus.

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