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math & puzzles Online Quiz - 98
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If one neutron is added to a helium nucleus, the result is:
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A
Helium
💡 Explanation:
The identity of an element is determined solely by the number of protons in its nucleus. Adding a neutron changes the isotope of the element but not the element itself. Therefore, adding a neutron to Helium results in a heavier isotope of Helium.