Fluorine has the smallest atomic radii because it is towards the right of the periodic table and on top.
ATOM
The atom is the smallest particle of an element that retains it's characteristics. Sub-atomic particles such as protons, neutrons and electrons form the atom and it is the amount of each of these sub-atomic particles that make the element that element.
If that substance is an element, the smallest part is the atom which, if broken down further into atomic particles, loses its identity.
An atom is the smallest bit of matter that isn't a sub-atomic particle. Minerals are made of atoms.
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
A hydrogen atom has the smallest radii.
The atoms with the largest atomic radii are found in the lower right side of the periodic table. Smallest atoms are found in the higher left part of the periodic table. He has the smallest atomic radii.
Atomic radii refer to the size of an atom, measured as the distance from the center of the nucleus to the outer electron shell. Ionic radii, on the other hand, refer to the size of an ion, which can be larger (anions) or smaller (cations) than the corresponding atom due to the gain or loss of electrons.
The group of elements with members of the smallest atomic radii for a given period is the group of noble gases. Noble gases have the smallest atomic radii because they have a completely filled valence shell, which results in strong electron-electron repulsions and a smaller atomic size.
The size of atom decreasing.
Smallest atom is hydrogen Largest atom is Francium
The ionic radii of metallic elements is smaller than its atomic radii, because the ion has less electrons. This gives it a smaller electron cloud and makes the atom smaller.
The elements with the smallest atomic radii are found in the top of the P block of the periodic table. Helium (He) has the smallest atomic radius. Francium, on the other side of the periodic table (very bottom of the S block), has the largest atomic radius.
Halogens have the smallest atomic radii in their respective periods because they have the highest effective nuclear charge due to their high electronegativity. This strong pull on the electrons results in a smaller atomic radius compared to other elements in the same period. Additionally, the addition of electrons to the same energy level does not shield the nuclear charge effectively, further decreasing the atomic radius.
hydrogen This is because it has the smallest Relative Atomic Mass =]
Atoms with the smallest radii in the alkaline-earth group are found at the top of the group, such as beryllium. This is because as you move down the group, additional electron shells are added, increasing the atomic radius.
Van der Waals radii are larger than atomic radii because they include the space occupied by the electron clouds around the atom, which are not considered in atomic radii. Van der Waals radii are used to estimate the effective size of atoms when they are close to each other and experience van der Waals forces.