Question
The provided image is Mendeleev's original periodic table, as first proposed over one hundred years ago. Based on the diagram above, what property did Mendeleev use when arranging his table? A Chemical reactivity B Atomic number C Atomic mass
Answer
4.2
(230 Votes)
Kellan
Master · Tutor for 5 years
Answer
C. Atomic mass
Explanation
Mendeleev arranged his periodic table based on the atomic mass of elements. He observed that elements with similar properties appeared at regular intervals when ordered by increasing atomic mass, leading to the periodic law.