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Atoms of the same element will always have the same number of Question Blank but will have different numbers of Question Blank if their mass numbers are different.

User Sgillies
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Answer:

proton and neutron respectively.

Step-by-step explanation:

Atoms of the same element will always have the same number of proton but will have different numbers of neutron if their mass numbers are different.

User Yalewzj
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