what is hiliyam????????????????????????
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a very light colourless gas that does not burn, often used to fill objects that float in the air (balloons)
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Helium is a chemical element with the symbol He and atomic number 2 . It is colourless and odorless , tasteless and non - toxic gas. It's boiling point is Lowest among all the elements.
- It was discovered in 1868.
- Its atomic number is 2.
- It's atomic mass is 4.002602 u.
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