Question

Define helium gas √√​

Answer 1

Answer:

helium (He), chemical element, inert gas of Group 18 (noble gases) of the periodic table. The second lightest element (only hydrogen is lighter), helium is a colourless, odourless, and tasteless gas that becomes liquid at −268.9 °C (−452 °F).

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Answer 2

# Definition of Helium Gas

= Helium is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Its boiling and melting point are the lowest among all the elements.

# Important Points about helium

• Symbol: He
• Atomic mass: 4.002602 u
• Atomic number: 2
• Electron configuration: 1s2
• Boiling point: -268.9 °C
• Electrons per shell: 2