Consider the following statements with reference to the periodic table of chemical element1. Ionisation potential gradually decreases along a period2. In a group of element, electron affinity decreases as the atomic weight increases3. In a given period, electronegativity decrease as the atomic number increases Which of these statement(s) is/are correct?

Periodic classification of elements is the method by which elements are grouped on the basis of their characteristics - we keep the elements that are alike in one group and the rest of the elements in the other group.