Which of the following electronic configuration an atom has the lowest ionisation

Which of the following electronic configuration an atom has the lowest ionisation enthalpy?

Options

(a) 1s²2s²sp³
(b) 1s²2s²2p⁵3s¹
(c) 1s²2s²2p⁶
(d) 1s²2s²2p⁵

Correct Answer:

1s²2s²2p⁵3s¹

Explanation:

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