a gas confined in a metal cylinder exerts a pressure of 1.50 atm at a temperature of 23.9°c.
what pressure will it exert if the temperature is lowered to -10.0°c?

i think it is true since you can test the answer and can use observations to complete it.

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.