Guessing its H+
Hydrogen then Lithium Fluorine.
H- Hydride ion
Helium has the smallest covalent radius
The radius of an anion is bigger than the radius of a neutral atom.
It is hydrogen.
it's neon
Atomic Radius gets greater down the periodic table and gets smaller to the right in the periodic table. This means, in order of atomic radius, that the five smallest elements are Helium, Neon, Fluorine, Oxygen, and Hydrogen in that order. Check all of it out at http://www.ptable.com/ under properties>radius
The smallest element is hydrogen (atomic number = 1). When one electron is added to hydrogen, hydride ion is formed and this is the anion with smallest ionic radius.
Helium has the smallest covalent radius
It is helium that has the smallest atomic radius. Use the link below to see a list of elements arranged by atomic radius.
Fluorine.
The radius of an anion is bigger than the radius of a neutral atom.
It is krypton as it the far most right on the periodic table, having the smallest radius
Fluorine
It is hydrogen.
When an element from anions, the radius of the ion increases when compared to that of the neutral atom. The same is the true for the element (phosphorus) and its anion (phosphide ion).
Rubidium
francium has the largest ionic radius
Helium usually is listed with the smallest atomic radius when calculated. Hydrogen however has a smaller van der Waals radius The protium isotope of hydrogen has the smallest nucleus radius. It is 1.6 fm