never ever underestimate cambridge examiners. but i can only blame myself for not studying hard enough? who says I.E is a negative value? -slap- myself. it's obvious that i should need energy to take an electron out mah!!!! ARGH~~!!!! i mean, i've nevr dealt with stuff that says I.E is a -ve value. i'm so zi zuo cong ming. fine. 7 marks gone. at least i answered the liquid carbon dioxide question correctly. wah lao. but it's such an unforgivable mistake. okie. i'll be happy if i get a C for chem.