Question

The electronic configuration of some neutral atoms are given below:

1s2

1s2 2s2 2p1

1s2 2s2 2p4

1s2 2s2 2p3

Which of the above is expected to have the highest

I. first ionisation enthalpy

II. second ionisation enthalpy

III. third ionisation enthalpy

IV. fourth ionisation enthalpy
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Answer 1

Answer:

for 1. ---- 1s2 as it has completely filled electrons in the s orbital

for 2.----- 1s2 2s2 2p4 as afyer losing an electron it aquires a stable electronic configuration having half filled orbitals 2 p

for 3.----- 1s2 2s2 2p1

for 4.--- 1s2 2s2 2p3. same reason after losing 3 e- it aquires a stable electronic config.