Explanation:
An atom consists if an electron, proton and a neutron. These are called as subatomic particles.
The mass of electron is [tex]9.1\times 10^{-31}\ kg[/tex]
The mass of proton is [tex]1.672623\times 10^{-27}\ kg[/tex]
The mass of the neutron is [tex]1.674929\times 10^{-27}\ kg[/tex]
The atomic mass of an element is the sum of protons and electrons. An element is defined as the species that has same number of protons.
A chemical compound is defined as the species that are composed of more than one molecules.
So, the correct order is electrons, protons, neutrons, elements and compounds.
