1.

The first `(IE_(1))` and second `(IE_(2))` ionisation energies `(k J mol^(-1))` of a new elements designated by roman numerals are shown below: `{:(,,IE_(1),IE_(2),),(I,,2370,5250,),(II,,520,7300,),(III,,900,1800,),(IV,,1700,3400,):}` Which of the above elements is likely to be : a. A reactive metal b. A reactive non-metal c. a noble gas d. A metal that forms a stable binary halide of the formula `AX_(2)` (`X=` the halogen).A. I,2372,5251B. II,520,7300C. III,900,1760D. IV,1680,3380

Answer» Correct Answer - B
As alkali metals have the lowest `IE_(1)` value in their respective periods and also there is a large jump between `IE_(1) and IE_(2)` due to the removal of second electron from the noble gas core,therefore,out of the given `IE_(1)`and `IE_(2)` values,(II) belongs to alkali metals.


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