Question

among the element of 2nd and 3rd period.. elements that has higher and lower ionisation enthalpy. elements that has smaller and larger atomic size. element that has 6 electron in its valence shell

Answer 1

3rd has higher ionization ethalpy and element that that has 6 electrons in the valence shell is not get completed so as per the Lewis dot structure that element has not completed so it will borrow another 2 electrons from any other element.