Valency of element Helium is ________.

Question

Question

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NPCIL Stipendiary Trainee 2021 Official Paper-I

Answer 1

The correct answer is 4) 0.

Key Points

Helium is a noble gas, which means it has a complete outer electron shell.
Helium has 2 electrons in its only electron shell, which is fully filled.
Since its outer shell is complete, helium does not typically form bonds with other elements.
Because it does not form bonds, helium has a valency of 0.

Additional Information

Noble Gases:
- Noble gases include helium, neon, argon, krypton, xenon, and radon.
- They are known for their lack of chemical reactivity due to having complete valence electron shells.
Electron Configuration:
- Helium's electron configuration is 1s², indicating a fully filled first shell.
Stable Electron Shells:
- Atoms with complete outer electron shells are generally stable and non-reactive.
Applications of Helium:
- Helium is used in cryogenics, as a cooling medium for nuclear reactors, and in gas chromatography.
- It is also used in balloons and airships due to its low density and non-flammability.