Study the given diagram and fill up the blanks with appropriate choice.

(P)Ionisation enthalpy , (Q)Electron gain , (R)Atomic radius, (S)Electronegativity

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(P)Atomic radius , (Q)Ionisation enthalpy , (R)Electronegativity, (S)Electron gain

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(P)Ionisation enthalpy , (Q)Atomic radius , (R)Electronegativity, (S)Electron gain

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(P)Electronegativity , (Q)Electron gain , (R)Ionisation enthalpy, (S)Atomic radius

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Solution

The correct option is A (P)Ionisation enthalpy , (Q)Electron gain , (R)Atomic radius, (S)Electronegativity
In a period, on moving from left to right in a period, (P) Ionisation enthalpy, (Q) Electron gain enthalpy and (S) Electronegativity increases. Whereas (R) Atomic radius decreases.

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