In this paper we prove the existence of an unbounded sequence of sign changing solutions to a laplacian fractional and critical problem in the Euclidean space by reducing the initial problem to an equivalent problem on the Euclidean unit sphere and exploring its symmetries.

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We consider a class of monomial weights $x^{A}=\vert x_{1}\vert^{a_{1}}\ldots\vert x_{N}\vert^{a_{N}}$  in $\mathbb{R}^{N}$, where $a_{i}$ is a nonnegative real number for each $i\in\{1,\ldots,N\}$, and we establish the $\varepsilon-\varepsilon$ property and the boundedness of isoperimetric sets with different monomial weights for the perimeter and volume. Moreover, we present cases of nonexistence of the isoperimetric inequality when it is not possible to associate the corresponding Sobolev inequality. Finally, for $N=2$, we developed an original type of symmetrization, which we call star-shaped Steiner symmetrization, and we apply it to a class of isoperimetric problems with different monomial weights.