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    Classification of Elements and Periodicity in Properties
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    Which one out of O and Se is bigger in size and why?

    Selenium has bigger atomic size because it comes after oxygen in the group (O, Se) and down the group size of atom increase.
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    Out of the following which has the smallest ionic 'Size and why: Li+, Na+, K+?

    All the three ions belong to alkali earth metal group (group 1). Ionic radius increases down the group, therefore Li+ ion has the smallest ionic size out of the three ions.
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    Which one out of Na+ and Cl- is bigger in size and why?

    The size of Cl- is greater as it has three shells (2, 8, 8) while Na+ ion has two shells only (2, 8).
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    What is the trend of ionisation enthalpy in a period?

    It increases from left to right in a period.

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    Out of P3-,  S2- and Cl- ions, which has the smallest value of ionic radius and why?

    All these elements are isoelectronic ions i.e. having same number of electrons (18) but their atomic numbers are different. Cl- ion (Atomic number 17) has the maximum effective nuclear charge, therefore, the size of Cl- ion must be the smallest out of the three ions. 
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