The particles which can be added to the nucleus of an atom without changing its chemical properties are called
Electrons
Protons
Neutrons
None of the above
Write the definitions of isotopes, isobar and isotone.
Assertion : Isobars are the elements having same mass number but different atomic number.
Reason : Neutrons and protons are present inside nucleus.
Given the mass of iron nucleus as $55.85\,u$ and $A=56$, find the nuclear density?
$\pi $ mesons can be
The mass of an $\alpha$-particle is