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Heli
| Heli | |
|---|---|
 | |
| Jina la Elementi | Heli |
| Alama | He |
| Namba atomia | 2 |
| Mfululizo safu | Gesi adimu |
| Uzani atomia | 4.002602 |
| Valensi | 2 |
| Densiti | 0.1785 kg/m3 |
| Ugumu (Mohs) | {{{ugumu}}} |
| Kiwango cha kuyeyuka | - K (-272.2 °C) |
| Kiwango cha kuchemka | 4.22 K (-268.93 °C) |
| Hali maada | gesi |
Heli (pia heliamu, ing. helium; kut. kigiriki ἥλιος hélios "jua") ni elementi ya kikemia yenye namba atomia 2 na uzani wa atomi 4.002602. Alama yake ni He. Ni atomi nyepesi ya pili kati ya elementi zote hivyo ina nafasi ya pili katika mfumo radidia wa elementi.
Huhesabiwa kati ya gesi adimu kwa sababu haimenyuki na elementi nyingine. Heli iko katika hali ya gesi hata kama halijoto au baridi ni kali ikiganda karibu na sifuri halisi tu; ni elementi ya pekee isiyoganda kabisa hata kwenye sifuri halisi kama shindikizo ni la kawaida.
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