Atom has a Snap! You can use that to install it on Gentoo, Arch, openSUSE, Fedora, Debian, etc.
I found this today:
Can’t this be duplicated in an official repo? Seems like the good sir Alan Franzoni already did all the work.
All script/configs is open unlike the post before.
We now have official Linux package repositories for .deb and .rpm based distributions.
Instructions for setting this up can be found in the Flight Manual: http://flight-manual.atom.io/getting-started/sections/installing-atom/#platform-linux.