In 1869, a major event in the history of chemistry occurred; it was the
A) discovery of the law of definite proportions.
B) discovery of the octet rule.
C) discovery of the law of conservation of mass.
D) development of the periodic table.

Question

Quizplus · Accepted Answer

In 1869, Dmitri Mendeleev developed the periodic table, organizing elements by atomic mass and properties, which was a major event in the history of chemistry.

In 1869, a Major Event in the History of Chemistry