1.

An element has successive ionization enthalpies as 940 (first), 2080, 3090, 4140, 7030, 7870, 16000 and 19500 kJ "mol"^(-1). To which group of the periodic table does this element belong ?

Answer»

14
15
16
17

Solution :`ubrace(underset(940)(IE_(1)) underset(2080)(IE_(II))underset(3090)(IE_(III))underset(4140)(IE_(IV))underset(7030)(IE_(V))underset(7870)(IE_(VI)))" "ubrace(underset(16000)(IE_(VII))underset(9500)(IE_(VIII)))`

so valence electron is 6 THUS it belongs to gr. 16


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