Come up with a Genus and Species for the Alien you discovered! Use greek or latin words with the meaning of each word. (ex. Genus - Nitidus - shining)

im not exactly sure but i think its b!

it is the most commonly accepted one

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.