Chemistry / Unit 2 Chem 0270 short lesson, about 20 seconds
Mendeleev, Meyer, and the Periodic Table's Origin
Captions available
The idea
Dmitri Mendeleev and Lothar Meyer independently proposed periodic arrangements of the elements around 1869–1870; historians still debate how credit should be divided.
In practice
Mendeleev's table predicted then-unknown elements like gallium and germanium, later discovered with properties matching his predictions closely.
Where people slip
Crediting only one scientist oversimplifies a genuinely disputed priority claim; this course states both contributions without adjudicating who deserves more credit.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
Unlocks
Something wrong in this lesson? Flag it · Sources for Chemistry