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The IE(1) and IE(2) (kJ mol^(-1)) of thr...

The `IE_(1)` and `IE_(2) (kJ mol^(-1))` of three elements A, B and C are given below :
`{:(,A,B,C,),(IE_(1),400,550,1150,),(IE_(2),2650,1070,2090,):}`
Identify the elements which represent (a) an alkali metal, (b) an alkaline earth metal or (c ) non-metal.

Text Solution

Verified by Experts

(a) (A)
Since `IE_(2)` of element `(A)` is very high as compared to `IE_(1)`, therefore it is an alkali metal.
`(b) (B)`
Since `IE_(1)` of element `(B)` is higher than that of element `(A)` and lower than that of element `(C )`, therefore it is an alkaline earth metal.
`(c) (C)`
Since `IE_(1)` of element `(C )` is the highest of the two elements `A` and `B`, therefore it is a non-metal.
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