Dmitri Mendeleer

1st Periodic Table, Kendra llanas, Duffey,Chase Walther

Who created the first accepted Periodic Table?

Dmitri Mendeleer

How did placing gaps where undiscovered elements might go make Mendeleev's table more acceptable?

It kept his groups more properly aligned.

What did Mendeleev do for these undiscovered elements that later validated his ideas?

He placed gaps in his periodic table where he thought these elements belonged.

What correction to the order of elements did Henry Moseley make to the Periodic Table?

He ordered them by atomic numbers instead of atomic mass,then the groups fall into their expected order.

What do we now know is the reason for the repeating patter of elements.

Scientists used atomic masses to place elements in order,but this seemed to throw some of the groups out of alignment.