Which one of the following represents the configuration of the three electrons with highest energy for the ground stale of an element in Group III?
Correct answer: D. 4s² 4p¹
- A. 1s¹ 2s¹ 2p¹
- B. 2s¹ 2p²
- C. 3p³
- D. 4s² 4p¹
Explanation
The correct answer is 4s² 4p¹, which corresponds to gallium (Ga), a Group III element. In this configuration, the three electrons with the highest energy are in the 4s and 4p orbitals, reflecting the typical electron distribution for elements in this group. The other options represent configurations that either belong to elements in different groups or configurations that do not reflect the highest energy electrons for a Group III element.
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