Assertion: proton's energy | /r/HasProperty | state of the 4th shell
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Source sentences:
text: This one is in the first (i.e. lowest energy) state of the 4th shell, which is a d-shell (ℓ = 2), and since p = ( − 1 ) l {\displaystyle p=(-1)^{l}} , this gives the nucleus an overall parity of +1.