The screening effect of inner electrons of the nucleus causes-
- decrease in the ionization enthalpy.
- increase in the ionization enthalpy.
- no effect on the ionization enthalpy.
- increase the attraction of the nucleus for the electrons.
and also give the reason along the answer.....
Dear Student
A valence shell electron in multi electron atom experiences an attractive force from the nucleus and a repulsive force from the inner shell electron. The combined effect of these two forces is that the attractive forces exerted by the nucleus on the valence shell electrons is partially decreased or weakened by the presence of repulsive force exerted by the inner shell electrons. Thus an electron shell experiences less attraction or pull towards the nucleus and there ionization energy decreases.
Hence the correct ans is (a)
A valence shell electron in multi electron atom experiences an attractive force from the nucleus and a repulsive force from the inner shell electron. The combined effect of these two forces is that the attractive forces exerted by the nucleus on the valence shell electrons is partially decreased or weakened by the presence of repulsive force exerted by the inner shell electrons. Thus an electron shell experiences less attraction or pull towards the nucleus and there ionization energy decreases.
Hence the correct ans is (a)