Which one has maximum number of unpaired electrons ?
Correct answer: B. 7Y
- A. 6X
- B. 7Y
- C. 9Z
- D. 13W
Explanation
The species represented by atomic number 7 has configuration 1s2 2s2 2p3, with three unpaired electrons in the three p orbitals. The likely alternative is 6X, but carbon has 1s2 2s2 2p2 and therefore only two unpaired electrons.
Last updated
About Electronic Configuration
Electronic configuration describes how electrons occupy shells, subshells and orbitals around an atom. Questions use the Aufbau principle, Pauli exclusion principle and Hund's rule to write configurations, identify valence electrons, form ions and explain periodic trends, including common exceptions such as chromium and copper.
Practise Atomic Structure
922 free Atomic Structure MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A neutral atom A has the electronic configuration: 1s2 2s2 2p6 3s2 3p6 4s1. It will gain or lose electron/s to form most probably an ion of valence:
According to Hund's rule, electrons entering a set of degenerate orbitals will
According to molecular orbital theory, which one of the following will indicate two unpaired electrons?
According to the n plus l rule, which orbital is filled first?
After 3s the sub-shell begin to fill is