An inflated balloon is left outside overnight. Initially, it has a volume of 38.7 L when the temperature is 255°C and the pressure is 9.4 atm. At what temperature (in °C) will the balloon have a volume of 65.9 L if the pressure falls to 4.2 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.