Can someone Help please List the methods you think is used to treat water for contaminants before it gets to your faucet.

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

plasma - state of matter made up of electrically charged particles

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.