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Q. How many subshells and electrons are associated with $n = 4$?

Structure of Atom

Solution:

When $n -4$ ; $l = 0$, $1$, $2$, $3$
Number of orbitals $= 1 + 3 + 5 + 7=16$
Number of electrons $= 2 + 6+10 +14 = 32$