The correct electron configuration for Is ________. A)[Br] 3d¹⁰4s²4p⁶ B)[Ar] 3d¹⁰4s²4p⁶ C)[Br] 4s²3d¹⁰4p⁵ D)[Ar] 3d¹⁰4s²4p⁵ E)[Ne] 3d¹⁰4s²4p⁶

Question

Quizplus · Accepted Answer

The electron configuration can be broken down into different subshells, which are filled in a specific order: 
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, and 7p.

Starting with the noble gas configuration, we would use [Ar]. 
Next, we fill in the 4s subshell (since it has a lower energy than the 3d subshell). 
Then we fill the 3d subshell, which comes before 4p. 
Finally, we fill in the 4p subshell.

Based on this pattern, the correct electron configuration is: 
[Ar] 3d10 4s1 4p1

Option B matches this configuration.

The Correct Electron Configuration for Is ________