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  4. Out of the four blocks in which periodic table is divided, helium belongs to which block?

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Q. Out of the four blocks in which periodic table is divided, helium belongs to which block?

Classification of Elements and Periodicity in Properties

Solution:

Helium belongs to the $p$-block, inspite of differentiating electron occupy $1 s$-orbital. Helium has a completely filled valence shell $\left(1 s^{2}\right)$ and as a result, it exhibits characteristic properties of other noble gases.