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

Explanation:

Moseley used X - ray spectroscopy to show that atomic number was a more fundamental property than atomic mass. He arranged elements by atomic number, which led to a more accurate periodic table.

Answer:

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