Question

which is bigger in size..an atom of hydrogen and a molecu​

Answer 1

Answer:

the answer is hydrogen and a molecu size

Answer 2

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. The larger charge leads to a smaller average size for the innermost s-orbital. There is some screening of the nuclear charge felt by one electron due to the presence of the other electron, but the closed K shell also adds a little stability.

This tendency of the innermost orbitals to shrink continues up the periodic table, as a result of which atoms don’t really grow as much in size as you might expect as you add electrons. The size growth is slower than linear. There are considerable and systematic variations in atomic radii as you cross closed electron shells.

Uranium, with 92 electrons, has an estimated atomic radius of 175 pm, only about three times as big as hydrogen, with one electron.

Explanation:

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