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def definition def or abbrev

cumulativeShellClosure

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formal statement (Lean)

 106def cumulativeShellClosure : ℕ → ℕ
 107  | 0 => 2       -- He
 108  | 1 => 10      -- Ne
 109  | 2 => 18      -- Ar
 110  | 3 => 36      -- Kr
 111  | 4 => 54      -- Xe
 112  | 5 => 86      -- Rn
 113  | n + 6 => 86 + (n + 1) * 32  -- Continuation
 114
 115/-- Period of element Z (which noble-gas-bounded period it belongs to). -/

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