What is displacement?

the moving of something from its place or position:

Explanation: hopes this helpe D:

its a reaction where an atom or a set of atoms gets displaced get taken over by another atom

Explanation:

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.