A)Light elements are stable if their ratio of protons to neutrons is 2:1.
B)Nuclei with 36 or more protons are unstable.
C)Isotopes with even numbers of protons and neutrons are more stable than those with odd numbers of protons and neutrons.
D)All isotopes with more protons than neutrons are stable.
E)Naturally occurring isotopes containing 1,3,5,7,9…protons or neutrons are stable.
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