Bluebulb Projects' The Measure of Things presents:
178 is about one-and-a-half times the number of Elements on the Periodic Table
In other words, it's 1.510 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 0.6620 times that amount.
(a.k.a. Periodic Table of the Elements, a.k.a chemical elements) (confirmed elements as of 2016)