Development Of The Periodic Table Flashcards
1
Q
In 1869, Russian Chemist Dmitri Mendeleev Arranged ____ Elements in a Table. He Placed them In Order of Their Atomic Weights. Then He ____________ them so that a Periodic Pattern in their Properties Could be Seen.
A
50…Arranged…
2
Q
It wasn’t Until the _____ Century that Scientists Began to Find Out More about the ____________ of the Atom.
A
20th…Structure…
