The factors on which the ionisation energy depend is atomic size. I.E. decreases as the atomic size increases. So the attractive force decreases. Also as the number of shells increases screening effect also increases and hence the I.E. tends to decrease. Related Theory The more electron shells there are, the greater the shielding effect experienced by the outermost electrons. As a result, atoms will be larger.
With which of the following electronic configuration an atom has the lowest ionisation enthalpy?
NEET UG 2007 — Chemistry Inorganic Chemistry
2007mcqeasy
With which of the following electronic configuration an atom has the lowest ionisation enthalpy?
Official previous-year question
Held on 30 Apr 2007 · Verified 9 Jul 2026.
Options
- A
1s22s22p3
- B
1s22s22p63s1
- C
1s22s22p6
- D
1s22s22p5
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