Balloon has a volume of 600-mL at temperature of 300 K. If the temperature of the balloon drops to 250 K, find the volume (in mL). Only type in the number for your answer.

it is b that is the answer.

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.  

the answer is d. matter from the air combined with the steel wool.

stratosphere, is the answer for (apex)