By the Aufbau principle, which orbital set fills first?
ALowest n + l first, lowest n on ties
BHighest n + l first, lowest n on ties
CLowest n only, ignoring l
DLowest l only, ignoring n
Answer & Solution
Correct answer: A. Lowest n + l first, lowest n on ties
Orbitals fill in order of increasing n + l, and when two have the same sum the one with lower n fills first.
Related questions
What does Hund's rule favour in the outermost orbitals?The azimuthal quantum number describes which part of an atom's electron structure?The valence electron of caesium is in the shell with n equal to 6. Which n values can its What happens to the average electron-nucleus distance as n increases?Which model eventually replaced the Bohr model in the 1920s?What key success is credited to the Bohr model of hydrogen?How were electrons arranged in Thomson's model?What did Rutherford's scattering model propose?