Bluebulb Projects' The Measure of Things presents:
140 is about one-and-one-fifth times the number of Elements on the Periodic Table
In other words, it's 1.190 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 0.840 times that amount.
(a.k.a. Periodic Table of the Elements, a.k.a chemical elements) (confirmed elements as of 2016)