An RPM package is provided for download on the Atom website, however, installing it on openSUSE Tumbleweed won’t install all of its dependencies. Running it from the console will give:
/usr/share/atom/atom: error while loading shared libraries: libgconf-2.so.4: cannot open shared object file: No such file or directory
According to the error message installing gconf2 will be required too.
sudo zypper install gconf2
After that Atom should work on openSUSE.