Please solve this question fast this is of chemistry use periodic table

Dear student, 
a) As we move down in a group, the atomic size increases , nuclear charge decreases , it becomes easy to take an electron out from the valence shell ,so lesser energy is required to do so.
Thus, sulphur has smaller ionisation energy as compared to oxygen.

b) Electronic configuration of
  • Li is 1s22s, can easily lose an electron to acquire stable noble gas configuration, thus forms Li+.
  • Be is 1s22s2, lose two electrons to acquire the stable noble gas configuration, thus forms Be2+.
Regards

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