EasyChemistry
+4 / -1
Which of the following electronic configuration of an atom has the lowest ionization enthalpy?
A
1s2 2s2 2p5
B
1s2 2s2 2p3
C
1s2 2s2 2p6 3s1
D
1s2 2s2 2p6
Explanation
The element with electronic configuration 1s2 2s2 2p6 3s1 shows lowest ionization energy because this configuration is unstable due to presence of the one electron in s-orbital. Hence less energy is required to remove the electron.
Previous
Which of the following pair of elements belongs to the same period?
NextElement with atomic number 10 belongs to;
More from Periodic Table
Hard
(A), (B) and (C) are elements in the second short period. Oxide of (A) is ionic, that of (B) is amph
HardThe basic character of MgO, SrO, K₂O and NiO increases in the order -
HardArrange into the order of increasing basicity (NO₂, K₂O, ZnO) -
HardArrange the following hydrides in their increasing acid strength [CH₄, H₂S, PH₃ and SiH₄] -
HardConsider the M(OH)₃ formed by all the group 13 elements. The correct sequence of acidic strength of
HardThe correct order regarding the electro-negativity of hybrid orbitals of carbon is ?
Practice Chemistry Exams
Full-length mock tests with detailed analytics, rank, and percentile.
Browse Exams