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31.

Which one out of O and Se is bigger in size and why?

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32.

Which one out of Na⁺ and Cl^- is bigger in size and why?

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33.

Out of P^3-, S^2- and Cl^- ions, which has the smallest value of ionic radius and why?

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34.

Out of the following which has the smallest ionic 'Size and why: Li⁺, Na⁺, K⁺?

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35.

What is the trend of ionisation enthalpy in a period?

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36.

What is the trend of ionisation enthalpy in a group?

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37.

Among the elements Li, K, Ca, S and Kr, which one has the highest first ionisation enthalpy and which one has the lowest first ionisation enthalpy?

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38.

For each of the following pairs state which one has greater ionisation enthalpy:
(i) I, I^- (ii) Br, K.

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Boron (B) has lowest Ionization energy.

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40.

What is the relationship between the first ionisation enthaplies and metallic properties?

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