v MODERN PERIODIC LAW
Physical and chemical properties of an
element are the periodic function of the atomic number.
v FACTORS AFFECTING ATOMIC SIZE
·
The attraction of electron.
I.e. atomic size α 1/nuclear charge
·
Number of shells
Number of shells α
atomic size.
·
Screening effect
The decrease in the force of attraction
exerted by the nucleus on the valence electron due to the presence of inner
electron
Screening effect α
atomic size
v IONISATION ENTHALPY (IE)
The minimum amount of energy required to
remove the most loosely bound electron from a isolated gaseous atom.
v ELECTRON AFFINITY (ELECTRON GAIN
ENTHAPLY)
The amount of energy released when an
electron is added to an isolated gaseous atom.
v ELECTRONEGATIVITY
The tendency of an element to attract an
electron to it.
v ELECTRONIC CONFIGURATION
Refer NCERT text.
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