Questions in atomic-structure

Select	Question
	The fundamental particles present in the nucleus of an atom are
	The order of density in nucleus is
	Cathode rays are
	Number of neutron in ${C^{12}}$ is
	Heaviest particle is
	Penetration power of proton is
	An elementary particle is
	The nucleus of helium contains
	Which is correct statement about proton
	Cathode rays are made up of