Graded homework problem 2 (revised).
| Element | EA | IE1 | IE2 | Ion Radius |
| kJ/mol | kJ/mol | kJ/mol | pm | |
| K | -48.4 | 418.8 | 3051 | 133 (K+) |
| I | -295.3 | 1008.4 | 1845.9 | 220 (I-) |
From above information, if needed, estimate the energy requirement (released or consumed?) when gaseous K and I atoms form a single molecule of [K2+][ I2-] (not K+I- salt). Use +500 kJ/mol as the estimated second electron affinity of iodine and assume no change in distance of closest approach.