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Successive ionisation energies of an element ‘X’ are given below (in k.cal) : IP₁ = 165 IP₂ = 195 IP₃ = 556 IP₄ = 595 Electronic configuration of the element 'X' is -
A
1s², 2s² 2p⁶, 3s² 3p²
B
1s², 2s¹
C
1s², 2s² 2p²
D
1s², 2s² 2p⁶, 3s²
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