Question

what is helium??

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Answer 1

Helium:-

⚫ Helium is a chemical element with symbol He and atomic number 2.

⚫It is colourless.

⚫ Helium is the second lightest element .

⚫ It has very low melting and boiling points.

⚫ Helium can be used to fill balloons.

⚫It is a gas at room temperature.

⚫The atomic weight is 4.002602.

⚫ Helium doesn't have odor .

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Answer 2

Helium

Helium is a noble gas comes in 18Th group.

The electronic configuration of Helium is 2S².

Helium gas don't react with any other elements because helium is a complete element, complete means here is that it has complete electronic configuration.

Noble gases:-

These gases are having complete electronic configuration.

Electronic configuration of noble gases are ns²np^6