Question

How to write rubidium-81 in complete electron configuration?

A) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹ 4d¹⁰ 5p⁶ 6s¹
B) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹ 4d¹⁰ 5p⁶
C) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹ 4d¹⁰
D) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹

Answer 1

The complete electron configuration for rubidium-81 (Rb), which has 37 electrons, is 1s² 2s² 2p¶ 3s² 3p¶ 4s² 3d¹⁰ 4p¶ 5s¹.

Step-by-step explanation:

To write the complete electron configuration for rubidium-81 (Rb), we need to account for all 37 electrons that Rb has. Starting from the first energy level, we fill each sublevel with electrons until all 37 are accounted for. The correct configuration is:

1s² 2s² 2p¶ 3s² 3p¶ 4s² 3d¹⁰ 4p¶ 5s¹.

Therefore, the correct answer is option D).