h2 chem compilation
| Front | electrophile |
| Back | an e- def species which is STRONGLY ATTRACTED to a region of high e- density or region of -ve charge |
| Front | cov bond w IONIC CHARAC (polar) |
| Back | - 2 diff elements w DIFF ELECTRONEGATIVITY (so bonding e-s not equally shared betw atoms) > separation of charge (dipoles) and cov bond is polar |
| Front | atomic / ionic rad (increases) |
| Back | - no. of protons increases, nuc charge increases- no. of e- shells increases, shielding effect increases significantly> outermost e- further away from the nuc n net attr betw outermost e- n nuc decreases> hence atomic / ionic rad increases down the grp |