With regards to a "data (age) structure diagram", which of the following is an indicator of a rapidly growing population?
a. a large elderly population
b. a large middle age population
a large teenage population
d a large child population

particle   p is an electron and particle q is a neutron

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.