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| 1. |
The first `(IE_(1))` and second `(IE_(2))` ionisation energies `(kJ mol^(-1))` of a new element designated by roman numericals are shown below: `{: (,(IE_(1)),(IE_(2))),(I,2372,5251),(II,520,7300),(III,900,1760),(IV,1680,3380):}` Which of these elements is likely to be (a) a reactive metal, (b) a reactive non-metal, (c) a noble gas and (d) a metal that forms a binary halide of the formula, `AX_(2)`. |
| Answer» a. `II` , b. `IV` , c. `I` , d.` III` | |