From each set, choose the atom which has largest ionisation entha… - Vidyadip

Question

From each set, choose the atom which has largest ionisation enthalpy and explain your answer:

F, O, N
Mg, P, Ar
B, Al, Ga

✓

Answer

F has highest ionisation enthalpy due to smallest atomic size, therefore, highest effective nuclear charge because it has 9 protons, O has 8 protons and N has 7 protons.
Ar has highest ionisation enthalpy due to stable electronic configuration.

1s² 2s² 2p⁶ 3s² 3p⁶

B has highest ionisation enthalpy due to smallest atomic size and, therefore, highest effective nuclear charge, has two shells only. Al has 3 shells, Ga has 4 shells.

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