discovered the periodic table

dedrick, nava, kevin ,Octavio

who created the first accepted periodic table

dmitri mendeleeve

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

It kept more groups aligned

what did mendeleev do for these undiscovered elements that later validated his ideas?

he predicted them.

what correction to the order of elements did henry moseley make to the periodic table?

atomic numbers and atomic mass

what do we now know is the reason for the repeating patterns of elements

because periodic means to repeat