The maximum number of electrons can be filled in the first shell of an atom are _____.
- A. 2 electrons
- B. 8 electrons
- C. 18 electrons
- D. 4 electrons
Explanation
The first electron shell has principal energy level n = 1, so its capacity is 2n² = 2 electrons. The capacities 8 and 18 apply to higher shells, not the first shell.