Talk:Atomos/@comment-2A02:582:8041:BF00:804D:DD15:58E5:A316-20180228132321/@comment-2605:6000:6DC0:D000:B0F6:E879:BB60:131C-20180430235446

Emphasis on the "Individual" part of that. In this case it is understood as being something that is indivisible. Undivided is a clumsy way to say it, but not entirely inaccurate.