Which sources of energy can be used to turn turbines to produce electrical energy? Lightning and fuel
Tides and clouds
Water and the sun
Wind and water

Wind and water

c) should be the answer.

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.