A student is given an unknown aqueous sample containing one of the three ions, Al3 , Ba2 , or Mg2 . There is limited unknown so the student can only run a couple of tests. Select all tests, based on the tables above, that will not provide useful information, even when performed correctly, to identify ions present in the unknown. Group of answer choices Na2CO3 Na2SO4 NH3 NaOH KI

the answer would be a

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.  

window cleaner is ammonia dissolved in water. this is an example of a