Find all the square roots
225

15

The square root of 225 is 15.

Explanation:

https://api-project-1022638073839.appspot.com/questions/how-do-you-find-the-square-root-of-1849#642333

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.