Multiple Choice
Which noble gas is used as the core in the noble gas electron configuration of iodine?
3
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10. Periodic Properties of the Elements
The Electron Configuration
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How many electrons can the second electron shell (n = 2) hold?
A
6
B
8
C
2
D
18
Verified step by step guidance1
Understand that the number of electrons a shell can hold is determined by the formula $2n^2$, where $n$ is the principal quantum number (the shell number).
Identify the shell number given in the problem: $n = 2$ for the second electron shell.
Substitute $n = 2$ into the formula: calculate $2 \times (2)^2$.
Simplify the expression: $2 \times 4 = 8$.
Conclude that the second electron shell can hold up to 8 electrons.
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