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
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.
The tendency of an element to attract an
electron to it.
v ELECTRONIC CONFIGURATION
Refer NCERT text.
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