Difference between Mendeleev Periodic Law and Modern Periodic Law
Mendeleev periodic law was based on atomic masses whereas modern periodic law is based on atomic numbers
Classification of Elements and Periodicity
Difference between Electron Gain Enthalphy and Electronegativity
Electronegativity is the ability of an atom to attract the shared or bonded pair of electrons whereas electron gain enthalphy is the energy change because of addition of electron in outermost shell