It is difficult to measure the atomic radius of chemical elements as the atomic size is of the order 1.2 x 10В№ m. The atomic radius of atoms generally increases from top to bottom within a group. Atomic radius is half of the distance between the adjacent atoms of the same element in any molecule.

The atomic radius of atoms generally decreases from left to right across a period.

By normal trend atomic radius increases along a period however the atomic radius of noble gases is fgreter than the adjacent halogen atom.ДЄtomic radius is determined as the distance between the nuclei of two identical atoms bonded together. Atomic radius is the measure of the distance from the centre of the nucleus to the outer electron. There is only one exception in the trend of atomic radi along the period. The increase in nuclear charge attracts the electrons more strongly, pulling them closer to the nucleus.Д«eside above, are there any exceptions to the atomic radius trend? This is caused by electron shielding.Д«eside above, why does atomic radius decrease across a period and increase down a group? Atomic radius decreases across a period because valence electrons are being added to the same energy level at the same time the nucleus is increasing in protons. Simply put, the atomic radius is half of the diameter of the atom, which is a result of the number of protons, neutrons, and electrons that compose the atom. Atomic radius increases from top to bottom within a group. One proton has a greater effect than one electron thus, electrons are pulled towards the nucleus, resulting in a smaller radius. This is caused by the increase in the number of protons and electrons across a period. In general, the size of an atom will decrease as you move from left to the right of a certain period.Д«esides, what causes atomic radius to increase? Periodic Trends of Atomic Radius An atom gets larger as the number of electronic shells increase therefore the radius of atoms increases as you go down a certain group in the periodic table of elements.

Atomic radius definition