81. What is a periodic property? How the following properties vary in a group and in a period ? Explain
a) Atomic radius
b) Electron gain enthalpy
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Group : Electronegativity values of elements decreases as we go down in a group. Period : Electronegativity increases along a period from left to right. Ionization energy increases from left to right in a period. Ionization energy decreases from top to bottom in a group.
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