(HELP ASAP PLEASE)How does the Bohr atom compare to the quantum mechanical model of an atom? How will you use the quantum mechanical model to further explain the phenomenon of colors in a fireworks display?

the atomic mass is the bottom number on the element.

-steel jelly

answer seismograph;

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.