хелиум

хелиум

An element with atomic number 2; symbol: He. It is the second most common element in the Sun and outer planets, but rare on the rocky planets.

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Loại từ: noun
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Ngành nghề/Lĩnh vực: Astronomy
Category: Planetary science
Company: PSRD
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Person engaged in or trained for spaceflight.

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An element with atomic number 7; symbol: N. It is common in Earth's atmosphere and along with hydrogen, carbon, and oxygen is essential for life.

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