In the universe, as a general trend, more massive atoms are less prevalent than lighter ones.There is, however, an exception to this pattern in the domain of low-mass elements.Using the figure below, identify the low-mass nuclei related to the aforementioned "exception," and briefly indicate how nuclear physicists explain this apparent oddity. 
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Enforceable
A term describing a contract or provision that is legally binding and can be upheld in court.
Postbox Rule
A legal principle in contract law stating that an offer is considered accepted at the moment the acceptance is dispatched by the offeree, not when it is received by the offeror.
Revocation
The process of formally withdrawing, cancelling, or annulling a decision, offer, or legal power.
Valid Contract
An agreement between two or more parties that is enforceable by law, meeting essential elements such as offer, acceptance, consideration, and legal purpose.
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