Question

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Answer 1

the azimuthal quantum number, l, is from \(\pm\) (n-1) to 0.

so if you have n=4, l=\(\underbrace{\pm3},\;\underbrace{\pm2},\underbrace{\pm1}, \underbrace0\)
f d p s
orbitals

therefore 7 values for l= \(-3,-2,-1,\;0,+1,+2,+3\)