Multiple choice general knowledge science & technology

If one neutron is added to a helium nucleus, the result is:

  1. Lithium

  2. Helium

  3. Hydrogen

  4. Carbon
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If one neutron is added to a helium nucleus (which has 2 protons and 2 neutrons), you get Helium-5, which is unstable and quickly decays back to helium by emitting a neutron. However, the question asks what the 'result' is - in terms of elemental identity, adding a neutron doesn't change the element. The element remains helium, as the number of protons (which defines the element) is unchanged.

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