What is the maximum number of d orbitals in a principal energy level?

Related questions

• How many electrons can s,p,d,f hold?
• How many atomic orbitals are there in the 4p sublevel?
• How many atomic orbitals are there in a g subshell?
• Why are s orbitals non directional?
• How many p-orbitals are occupied in a K atom?
• How many p-orbitals are occupied in a N atom?
• How many electrons can an f orbital have?
• How many electrons can there be in a p orbital?
• How many electrons can ap orbital hold?
• How many electrons can an s orbital have?