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def definition def or abbrev

nextClosure

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formal statement (Lean)

 136def nextClosure (Z : ℕ) : ℕ :=

proof body

Definition body.

 137  if Z ≤ 2 then 2
 138  else if Z ≤ 10 then 10
 139  else if Z ≤ 18 then 18
 140  else if Z ≤ 36 then 36
 141  else if Z ≤ 54 then 54
 142  else if Z ≤ 86 then 86
 143  else 118  -- Oganesson
 144
 145/-- Distance to next noble gas closure.
 146    At noble gases, this equals 0 (shell complete). -/

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