How the following properties varies in a group and in a period
(a) Atomic radius (b) Ionisation energy
(c) Electronegativity (d) Electron gain enthalpy
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Thus, the force of attraction between the nucleus and added electron increases. Hence, electron gain enthalpy becomes more negative while moving right across a period. Variation of electron gain enthalpy in a group: Generally, when we move down in a group becomes less negative.
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Period (from left to right)
Group (from top to bottom)
(A) Atomic radius Decreases Increases
(B) Ionization energy
Increases Decreases
(C) Electronegativity Increases Decreases
(D) Electropositive nature
Decreases
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