Read carefully. Answer MUST be rounded to the hundredths place. Do not add spaces, symbols or units. Number only. A gas has a pressure of 3.00 atm at 27◦C. At what temperature will the gas have a pressure of 0.50 atm?

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.