Before you post code, you have to format it as code by highlighting it and pressing the
</> button above the editor. Alternatively, you can post a screenshot or a link to a copy of the actual file. These other strategies can be more useful when it comes to debugging Atom’s CSON files, since the mistakes that a novice user is likely to make are hard for novice users to identify. It’s frequently easier to provide experts (myself and a few others here) with a complete snapshot of all files concerned. In this particular case, the fastest solution would be to copy your entire keymap file and post it on Hastebin.
When you’re testing keybindings, you can use the Keybinding Resolver (ctrl-.) to see the full list of commands that get matched for each individual combination. Does ctrl-alt-g bring up anything?