In an acid-base titration, 45.78 ml of HCl solution is titrated to the end point by 37.15ml of 0.4388M NaOH solution. What is the molarity of the HCl solution? 1. 0.1780M
2. 0.3561M
3. 0.4388M
4.0.7122M
5. 0.7430M​

answeridentity;

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.