Multiple choice

What did Döbereiner create?

  1. Triads

  2. Periodic Table

  3. Metals

  4. Nonmetals

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Johann Wolfgang Döbereiner observed that groups of three elements, which he called triads, exhibited similar chemical properties and that the atomic mass of the middle element was approximately the average of the other two.