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An element 'A' - is present in period 3 ...

An element 'A' - is present in period 3 and group-2 of the periodic table.
Give a reason why ionisation potential of 'A' is higher than that of B":

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ICSE-MODEL PAPER-2-SECTION-II
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  11. An element 'A' - is present in period 3 and group-2 of the periodic ta...

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  12. An element 'A' - is present in period 3 and group-2 of the periodic ta...

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  13. An element 'A' - is present in period 3 and group-2 of the periodic ta...

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