Which of the following are formulations of the second law of
thermodynamics?

A. No system can convert energy from one form to another useful
form with 100% efficiency.

B. It isn't possible to transfer heat from an object at a higher
temperature to another object at a lower temperature unless work
is done.

C. Entropy of a system increases over time.

D. It's possible to change heat completely into work, with no other
change taking place.

they are made of gases.

they have a spherical shape.

they make energy through fusion.

the answer would be 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.