Return to periodic tableH' at. wt. (natural) 1.007967 at. wt. (H') 1.007822 at. no. 1 m.p. - 259.140C b.p. - 252.870C density 0.08988 gm./l density (liquid) 70.8 gm/i. (-2530C) density (solid) 7016 gm/i. (-2620C) valence 1.
| K | L | M | N | O | P | Q |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| s | s p | s p d | s p d f | s p d f | s p d f | s p d f |
| 1 |
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