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

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

    Answer

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

    Answer

    What is the trend of ionisation enthalpy in a period?

    Answer
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