Multiple Choice
Which of the following is the correct electron configuration for technetium (Tc, atomic number 43)?
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
How many electrons can occupy the second energy level (n = 2) of an atom?
A
6
B
8
C
18
D
2
Verified step by step guidance1
Recall that the maximum number of electrons in any energy level (shell) is given by the formula $2n^2$, where $n$ is the principal quantum number (energy level).
Identify the principal quantum number for the second energy level: $n = 2$.
Substitute $n = 2$ into the formula: $2 \times (2)^2$.
Calculate the value inside the parentheses first: $(2)^2 = 4$.
Multiply by 2 to find the maximum number of electrons: $2 \times 4 = 8$ electrons can occupy the second energy level.
Related Videos
Related Practice
The Electron Configuration practice set
Problem sets built by lead tutorsExpert video explanations