Following are the symbols and formulae for some of the elements and compounds.
Na, H2, CO2, NH3, O2, Fe, He, HCI, N2,
H2O, FeS, CI
Separate them as elements and
compounds and give their names.
What conclusion do you make on the basis
of the above activity ?

Iwould you figure it out but you don't have a picture or in your question as to what the physical property you're looking for is

The atomic nucleus made up from protons (yellow) and neutrons (blue) and held together by nuclear forces. nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. they bind protons and neutrons (“nucleons”) into atomic