Write a set of directions for a red blood cell to deliver oxygen to the brain. Include all the words in the word bank. Lungs, heart, brain, aorta, arteries, and veins Must be 6 sentences using the words I don't think it's in order though.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.