Can the 4th Shell hold 32 electrons?

This would mean 2 electrons could fit in the first shell, 8 could fit in the second shell, 18 in the third shell, and 32 in the fourth shell.

What is the maximum number of electrons in the 4th Shell?

32
Each shell must be full before the next starts to fill. This model breaks down at the n=3 shell because each shell has subshells. There are 4 subshells, s, p, d, and f. Each subshell can hold a different number of electrons.
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n= Shell Maximum Number of Electrons
2 2nd Shell 8
3 3rd Shell 18
4 4th Shell 32