Which describes mid-oceanic ridges?
a. transform plate boundary between oceanic plates
b. convergent plate boundary involving an oceanic plate
c. divergent plate boundary in oceanic plates
d. divergent plate boundary in a continental plate

c. orbital shape i hope this is 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.