How can you express
the rate of flow of people into a
stadium? How can you express
the rate of flow of charges
through a wire?

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;

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.