Multiple Choice
Which of the following represents the correct ground-state electron configuration for the Pb^{2+} ion?
2
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 electron configurations correctly represents the electron density of aluminum (Al, atomic number 13)?
A
1s^2 2s^2 2p^6 3s^2 3p^3
B
1s^2 2s^2 2p^6 3s^2 3p^2
C
1s^2 2s^2 2p^6 3s^1 3p^2
D
1s^2 2s^2 2p^6 3s^2 3p^1
Verified step by step guidance1
Step 1: Identify the atomic number of aluminum (Al), which is 13. This means aluminum has 13 electrons to be arranged in its electron configuration.
Step 2: Recall the order in which electron orbitals are filled according to the Aufbau principle: 1s, 2s, 2p, 3s, 3p, and so on.
Step 3: Fill the orbitals with electrons following the maximum capacity of each orbital: 1s can hold 2 electrons, 2s can hold 2, 2p can hold 6, 3s can hold 2, and 3p can hold 6.
Step 4: Distribute the 13 electrons accordingly: fill 1s with 2 electrons, 2s with 2 electrons, 2p with 6 electrons, 3s with 2 electrons, and place the remaining 1 electron in the 3p orbital.
Step 5: Write the electron configuration based on this distribution: $1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{1}$, which correctly represents the electron density of aluminum.
Related Videos
Related Practice
The Electron Configuration practice set
Problem sets built by lead tutorsExpert video explanations