Question

which is smaller?

hydrogen or helium?

Answer 1

Answer:

Helium has an atomic radius of 31 pm, hydrogen has an atomic radius of about 53 pm. So an atom of helium is significantly smaller than an atom of hydrogen measuring by the radius of the electron cloud. This is mostly because the charge of the helium nucleus is twice as big as that of the hydrogen nucleus.

Answer 2

Answer:

hydrogen is the smaller....

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