A. [OH−] = 5.8×10−11 M Express your answer using two decimal places. B. [OH−] = 9.6×10−3 M Express your answer using two decimal places.
C. [OH−] = 9.8×10−12 M Express your answer using two decimal places.
D. [OH−] = 6.4×10−4 M Express your answer using two decimal places.

i believe that it is a exoplanet

the answer is d.) potassium

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.