The qualitative analysis experiment you did is actually an abbreviated version of a much larger analysis scheme in which many different cations are separated and identified. Suppose a mixture contains Ag+, K+, NH4+, Hg22+, Pb2+, Mg2+, Sr2+, Ba2+, Cu2+, Al3+ and Fe3+. Required:
a. What ions could you separate, by causing them to precipitate, with the addition of HCl?
b. After the addition of HCl, the above sample is centrifuged and decanted. Which cations remaining in the supernatant could you separate, by causing them to precipitate, with the addition of H2SO4?

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answerspecific gravity;

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.  

it's 3.2 on edge, i just took the test.