PLEASE ANSWE

Label friction, conduction, or induction

1. touching a metal sphere with a negatively charged rod
2. moving a negatively charged rod near a metal sphere that is grounded
3. touching a metal sphere with a positive aluminum plate

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.