Is This Isomorphic?

A set $G=\{z \in \mathds{C}\ |\ z^n=1\ \textrm{for some}\ n \in \mathds{Z}^+\}$ forms a group under multiplication: $(G,\cdot)$ .

And think of group of set of modulo integers under addition: $(\mathds{Z}/n\mathds{Z}, +)$ .

Are these 2 groups isomorphic? It appearantly seems like: a circulation under order n, but is it really true? And if, how can it be proven?

#Algebra

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Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$