Understanding Closed Neutron Shells: Determining the Elements with Stable Nuclei

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Homework Statement




which of the following has closed neutron shells? (the number in front should be a superscript) 36S, 50V, 50Ca, and there are more but i just want to understand why.

Homework Equations





The Attempt at a Solution


i know the answers, i just don't know how to get there. for example 36S has closed neutron shells, but how do i know this? please help
 
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