The maximum number of electrons that can occupy the third shell is
Correct answer: B. 18
- A. 8
- B. 18
- C. 32
- D. 2
Explanation
Shell capacity is 2n squared, so for n equal to 3 the maximum is 2 multiplied by 9, that is 18, made up of 2 in 3s, 6 in 3p and 10 in 3d. The figure 8 is the octet that fills only the s and p subshells, which is why it is the tempting answer. The fourth shell holds 32 by the same formula.
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About Quantum Numbers
Quantum numbers describe an electron's energy level, subshell, orbital orientation and spin. You examine the principal, azimuthal, magnetic and spin quantum numbers, their allowed values, orbital capacity and how they determine electronic configurations and distinguish electrons within an atom.
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