If an atom has 17 electrons and its mass number is 35, calculate the following: - number of protons - number of neutrons -atomic number

6.4 cm (max) - 25 cm (min)

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.