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The (IE(1)) and the (IE(2)) in kJ mol^(-...

The `(IE_(1))` and the `(IE_(2))` in `kJ mol^(-1)` of a few eiements designated by Roman numberals are shown below.
`|{:(,I,II,III),(IE_(1),403,549,1142),(IE_(2),2640,1060,2080):}|`
Which of the above elements is likely to be a
(a) non-metal (b) alkali metal (c ) alkaline earth metal?

Text Solution

Verified by Experts

The correct Answer is:
(a) non-metal (iii)-Due to highest ionisation energy, `(IE_(1))` and `(IE_(2))`.
(b) alkali metal (I) -Due to lowest ionisation energy, `(IE_(1))` and there is quite high jump in `(IE_(2))` due to inert gas configuration.
(c ) alkaline earth metal (II) -There is little difference in `(IE_(1))` and `(IE_(2))` and the value of `(IE_(1))` is slightly greater than (I) due to stable configuration `(ns^(2))`.
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