The development of nuclear power has provided electricity for less money, but at a cost. what may be considered a "cost" of nuclear power?
a. large amounts of energy are produced very cheaply.
b.
it takes a lot of energy to run a nuclear power plant.
c.
nuclear power plants provide new jobs for a community.
d.
the radioactive waste is unsafe and hard to store safely.

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.