Mendeleev built the periodic table before protons were known
Dmitri Mendeleev revolutionized chemistry by creating the periodic table based on atomic weight, predicting new elements long before protons were even discovered.
Imagine organizing elements without knowing about protons! In 1869, Dmitri Mendeleev created the first widely accepted periodic table by arranging 63 known elements by their atomic weights. He noticed elements with similar properties appeared at regular intervals, allowing him to group them into families.
There's more to this story — open the app to keep reading.
Continue Reading in App
2 more paragraphs · plus a 3-question quiz