For each of the following reactions, write a balanced complete chemical equation, ionic equation, and net ionic equation.
Identify and label any spectator ions if applicable, and identify the type of reaction taking place.
Make sure to include states of matter.

a. Liquid bromine reacts with a solution of hydrochloric acid.

b. Cobalt (II) iodate is mixed with a solution of iron (III) oxalate

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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.