Find the mass percent Ca(OH) 2 in a 5.0 gram sample of calcium hydroxide solution if it takes 4.1 of .12 neutralize the Ca(OH) 2 .

the answer is c. nacl

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.