True or false: brown smog is formed primarily by sulfur dioxide and suspended solid particles. a. true b. false

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)

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.