.

Similarly one may ask, which element has the smallest volume?

The element with smallest radii is Helium.

Also, is helium the smallest atom? Helium has two protons and two electrons in the same shell as hydrogen . Hydrogen has that 1 electron in k shell and helium has 2 electrons in k shell . Therefore helium has the smallest atomic size .

In this regard, which has smallest size?

Helium has the smallest atomic radius because the stronger force between the two protons and two electrons pulls the electron shell in closer than the lone electron and lone proton in a Hydrogen atom.

Which element has the highest ionization energy?

From this trend, Cesium is said to have the lowest ionization energy and Fluorine is said to have the highest ionization energy (with the exception of Helium and Neon).