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Choose the electronic configurations tha...

Choose the electronic configurations that are possible from among the following. Explain why the others are impossible.
a '1 s^2 2 s^3 2 p^6'
b '1s^2 2 s^2 2 p^4'
C '1 s^2 2 s^2 2 p^8 3 s^2 3 p^6 3 d^7'
d '1 s^2 2 s^2 2 p^6 3 s^2 3 d^9'

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i. Lowest ionisation enthalpy .=D. Highest ionisation enthalpy .=A. ii. Order of increasing n(eg)ative electron gain enthalpy is .A
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