The reactivity of an element is very much related to its inoization enthalpy. Observe the following graph in wich the first ionozation enthalpies (delta_1H) of elements of the sercond period are ploptted agiains their atomic number (Z):

The reactivity of an element is very much related to its inoization en

1.	The reactivity of an element is very much related to its inoization enthalpy. Observe the following graph in wich the first ionozation enthalpies (delta_1H) of elements of the sercond period are ploptted agiains their atomic number (Z):
Answer» Solution :From the GRAPH it is clear that, Be has HIGHER inoization ENTHALPY than B. nitrogen has higher ionisation enthalpy than O. this is because Be has complitlely FILLED `(1s^2 2s^2)` 2sorbital.