Bluebulb Projects' The Measure of Things presents:
3,500 is about thirty times the number of Elements on the Periodic Table.
In other words, it's 29.70 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 0.0337 times that amount.
(a.k.a. Periodic Table of the Elements, a.k.a chemical elements) (confirmed elements as of 2016)