In which of the following compounds does hydrogen have a negative oxidation number? a) CH4
b) H2O2
c) NH3
d) NaH​

not clear

0.88m hope i am correct : )

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.