Multiple Choice
Which of the following is the correct electron configuration for the bromide ion, Br−?
1
views
10. Periodic Properties of the Elements
The Electron Configuration
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following represents the ground-state electron configuration of the sulfide ion, S^{2-}?
A
1s^2 2s^2 2p^6 3s^2 3p^2
B
1s^2 2s^2 2p^6 3s^2 3p^5
C
1s^2 2s^2 2p^6 3s^2 3p^6
D
1s^2 2s^2 2p^6 3s^2 3p^4
Verified step by step guidance1
Identify the atomic number of sulfur (S), which is 16. This means a neutral sulfur atom has 16 electrons.
Determine the electron configuration of neutral sulfur by filling orbitals in order of increasing energy: 1s, 2s, 2p, 3s, and then 3p.
Since the sulfide ion (S^{2-}) has gained 2 extra electrons, add these to the neutral sulfur's electron count, making a total of 18 electrons.
Write the electron configuration for 18 electrons by filling the orbitals in the correct order, ensuring the added electrons occupy the 3p orbital to complete it.
Compare the resulting electron configuration to the options given to identify which one correctly represents the ground-state electron configuration of S^{2-}.
Related Videos
Related Practice
The Electron Configuration practice set
Problem sets built by lead tutorsExpert video explanations