Why does the vapor pressure of a solution decrease when an ionic compound is added to it? 1) Most solutes have a positive heat of solvation, causing the temperature of the solution to decrease.
2)There are fewer solvent molecules at the surface, so fewer can vaporize and leave the solution.
3) The mole fraction of solvent is higher, causing a lower vapor pressure.

aluminum

i guess but i think im right

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

-love shrooms

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.