29
/
en
AIzaSyAYiBZKx7MnpbEhh9jyipgxe19OcubqV5w
April 1, 2024
1637726
130521
2
Create
Public Timelines
Library
FAQ
For education
Cabinet
For educational institutions
For teachers
For students/pupils
may 23, 1869 - -The Periodic Law -Arrange by Atomic Weight, but atomic properties are the most important -Leftover gaps are the undiscovered elements
Added to timeline:
15 Sep 2018
0
0
82
New timeline
Date:
may 23, 1869
Now
~ 155 years ago