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Dear Student,
The periodic properties followed in a periodic table are Ionization energy, atomic radius, electron affinity, and electronegativity.
There is seen a general trend in the periodicity of elements:
1. Moving across the period (Left to Right)-
 Ionization energy increases
 Electronegativity increases
Electron affinity increases
Atomic Radius decreases
 2. Moving from up to down the group-
Ionization energy decreases
 electronegativity decreases
 Electron affinity decreases
Atomic radius increases
 Hope this information will clear your doubts about the topic.
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