distribui.js

const count = arr =>
  arr.map( (subarr) =>
    subarr.length ).reduce( (acc, l) => acc + l, 0)

const step = ({
  source: [ [ head, ...mtail ], ...tail],
  result
}) => ({
  source: mtail.length === 0 ? [...tail] : [ [...mtail], ...tail ],
  result: [...result, head]
})


const order = arr => (
  Array.apply(null, Array(count(arr)))
    .reduce( step, { source: arr, result: []})
    .result
)

module.exports = order

index.js

'use strict'
const distribuicao = [
  ['1s2'],
  ['2s2', '2p6'],
  ['3s2', '3p6', '3d10'],
  ['4s2', '4p6', '4d10', '4f14'],
  ['5s2', '5p6', '5d10', '5f14'],
  ['6s2', '6p6', '6d10'],
  ['7s2', '7p6']
]

const run = require('./distribui')


console.log(
  run(distribuicao)
)

Cara esse seu distribui ele só está ordenando:

[ '1s2',
  '2s2',
  '2p6',
  '3s2',
  '3p6',
  '3d10',
  '4s2',
  '4p6',
  '4d10',
  '4f14',
  '5s2',
  '5p6',
  '5d10',
  '5f14',
  '6s2',
  '6p6',
  '6d10',
  '7s2',
  '7p6' ]