Which is larger a hydrogen atom or a helium atom?

Helium belongs to the right in the periodic table and as we move from hydrogen to helium number of inner shell electrons increases and effective nuclear charge increases and thus its size is smaller than the hydrogen atom.

Which is bigger He+ or H?

He+ has a larger nucleus (bigger effective nuclear charge), so the electron gets pulled closer to the nucleus and the radius is smaller. H- has one more electron but the same amount of protons as H, so I think that H- has a slightly larger radius than H.

Why is helium the smallest atom?

Explanation: Helium has the smallest atomic radius. This is due to trends in the periodic table, and the effective nuclear charge that holds the valence electrons close to the nucleus. Atomic radius decreases as you move across a period from left to right and decreases as you move up a group from bottom to top.

Why is hydrogen not the smaller than helium?

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.

Is helium heavier than hydrogen?

Hydrogen versus helium Hydrogen and helium are the most commonly used lift gases. Although helium is twice as heavy as (diatomic) hydrogen, they are both significantly lighter than air, making this difference negligible.

Which is smaller atom hydrogen or helium?

Answer Expert Verified Though helium is more in weight than Hydrogen element due to more electrons and protons, but atomic radii of helium is smaller than hydrogen. helium is the smallest element in whole Modern periodic table. Its atomic radius is 31 pm while hydrogen is 53 pm.

Is hydrogen or helium the smallest atom?

The smallest atom is helium with a radius of 31 pm, while the largest known is caesium at 298 pm. Although hydrogen has a lower atomic number than helium, the calculated radius of the hydrogen atom is about 70\% larger.

Which is smallest atom hydrogen or helium?

Answer Expert Verified helium is the smallest element in whole Modern periodic table. Its atomic radius is 31 pm while hydrogen is 53 pm. Francium Is the biggest atom in whole Modern periodic table.

Why is helium the smallest element?

Helium is the smallest atom. An electron gets added to each element from left to right and in the same shell. More the attraction, less the space. Therefore helium has the smallest atomic size.

Which element has the largest atom?

Lithium (Li) element
Lithium (Li) element has the largest atom. Largest atom is defined by its atomic radius i.e. the distance between nucleus to its outermost orbit/ valency shell. As we move from left to right in the periodic table the atomic radius decreases.