How many NHL natural hat tricks in a single period have been scored?

Only having data for the 2017-2018 NHL season at my disposal:

• 81 hat-tricks were scored throughout the season
• 13 were natural

• 6 natural hat-tricks were scored in a single period (46.15% of all natural hat-tricks)

  • Jamie Benn (1st period)
  • Radek Faska (2nd period)
  • William Karlsson (2nd period)
  • Jason Zucker (3rd period)
  • Teuvo Teravainen (3rd period)
  • John Tavares (3rd period)