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Distribution of the 246,363 radicals by location of the unpaired electron.
| Element | Primary | Secondary | Tertiary |
|---|---|---|---|
| C | 56,067 | 121,369 | 28,135 |
| N | 11,349 | 14,048 | |
| O | 15,354 |
Primary, secondary, and tertiary refers to atoms having 1, 2, or 3 non-hydrogen neighbors.
