Question

the element with least ionisation energy in second period​

Answer 1

During second ionization energy, beryllium has to lose one more electron in order to attain a noble gas configuration of helium. Hence, it can lose its second electron easily. Hence, we can conclude that beryllium has Lowest Second Ionization Energy because of its ability to attain noble gas configuration.

Answer 2

Element with least ionisation energy in the second period of the periodic table is Li (lithium)