Ionic compounds form from a repeating pattern of ions. O fibers
O rough edges
O a sticky surface
O crystals

crystals

It's in my science book, my class just finished this chapter.

elements make up everything, and they combine to make compounds.

the answer is c

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.