Question- lanthanum-139 is a stable nuclide but, Ask an Expert

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Question- Lanthanum-139 is a stable nuclide but lanthanum-140 is unstable (t1/2 = 40 hr). What rule of thumb involving nuclear stability is involved?

Select all that apply.

Lanthanum-139 is stable because it has a magic number of neutrons (82).

Lanthanum-139 is stable because it has an odd number of protons and an even number of neutrons (the "odd-even rule").

Lanthanum-140 is unstable because it has a magic number of neutrons (83).

Lanthanum-140 is unstable because it has an odd number of protons and an odd number of neutrons (the "odd-even rule").

None of these.

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Category:- Chemistry
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