1.

For an element the successive ionisation energy value (in `eV " atom"^(-1)` ) are given below `12.32, 26.84, 44.56, 65.63, 203.9, 251.12, 308.4` The element that satisfies the above values is :A. SiB. CaC. AlD. S

Answer» Correct Answer - A
Sudden jump is observed between `IE_(4)` and `IE_(5)`
thus valence electrons `= 4`
configuration of valence shell `= ns^(2)np^(2)`
Thus element belongs to p-block with 4 valence electrons


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