Classify the following as either an element, a compound, a heterogeneous mixture, or a homogeneous mixture and explain your answer. Skittles
Kool Aid
Pepsi
Gold (Au)
Carbon Dioxide (CO2)
Hydrogen (H2)
Raisin Bran Cereal
Lucky Charms Cereal
Salt Water
Salt (NaCl)
Oxygen (O2)
Methane (CH4)

here's the link to your question!

explanation:

50.23 i believe is correct but don't quote me on that.

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.