Examine the equation of a reversible reaction.

2so2 + o2 ⇌ 2so3

which of the answer choices correctly lists the reverse reaction?

2so2 + 2so3 → o2

2so3 + 2so2 → o2

2so3 + o2 → 2so2

2so2 + o2 → 2so3

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.