Question

How did Moseley establish a more accurate periodic table?
by arranging the elements according to atomic mass instead of atomic number
by arranging the elements according to atomic number instead of atomic mass
by arranging the elements into horizontal periods
by arranging the elements into vertical groups

Answer 1

by arranging the elements according to atomic number instead of atomic mass

Explanation: Moseley used X-ray spectra to determine each element's atomic number (nuclear charge), showing the periodic table's order is based on atomic number, which resolved inconsistencies in ordering by atomic mass.