STANDARDChemistry-Periodic Table
STANDARD Chemistry Ionisation Enthalpy MCQ Question
Type: MCQ-conceptual-Medium
Which of the following electronic configuration of an atom has the lowest ionisation enthalpy?
A
1s²2s²2p³
B
1s²2s²2p⁵3s¹
C
1s²2s²2p⁶
D
1s²2s²2p⁵
Correct Answer
Option B
Detailed Explanation
1s², 2s², 2p⁵, 3s¹ is an unstable configuration with the outermost electron in 3rd orbit. Hence, it has lowest ionisation enthalpy.
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