Please help Naming rule:
1) Write the name of the metal
2) Write the name of the nonmetal
3) Change the ending of the nonmetal to -ide.
Example: PuCz Prunium cornine Prunium cornide
W
w
W
Name these lonic Compounds using the “Periodic Table of Food":
2. BPO
3. Bl2Tu
4. Cr2Sn
5. LiSr2
6. Or3Ba2

i think it's letter a.

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.