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The first(IE(1)) and second (IE(2))Ioniz...

The first(IE_(1)) and second (IE_(2))Ionization energies (KJ/mol) of a few elements designated by roman numerals are given below.Which of these would be an alkali metal?

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a. Most reactive metal will be an alkali metal of the `1st` group with its `IE_(2) gt IE_(1)`. Thus, the most reactive metal is `II`.
b. Most reactive non-metal will be a halogen of the `17th` group. Its `IE_(1)` will be quite high. Thus, most reactive non-metal is `IV`.
c. A noble gas will have very high `IE_(1)`. Thus, `I` is a noble gas.
d. A metal that forms a stable binary halide will be an alkaline earth metal of the `2nd` group. Its `IE_(2)` will not be much higher than `IE_(1)`. Thus, `III` is such a metal that forms a stable binary halide of formula `AX_(2)`.
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