Atom Definition. An atom is the defining structure of an element, which cannot be broken by any chemical means. A typical atom consists of a nucleus of protons and neutrons with electrons orbiting this nucleus. However, an atom can consist of a single proton (i.e., the protium isotope of hydrogen) as a nucleus.
Mosaic art flourished in the Byzantine Empire from the 6th to the 15th centuries; that tradition was adopted by the Norman kingdom in Sicily in the 12th century, by eastern-influenced Venice, and among the Rus in Ukraine.osaic is an art form which uses small pieces of materials placed together to create a unified whole. The materials commonly used are marble or other stone, glass, pottery, mirror or foil-backed glass, or shells.
Towards the end of the 18th century, artisans left the Vatican's Reverenda Fabbrica and brought the art of mosaics in Florence, where it found a fertile terrain for rapid growth. The existence of small workshops operated by mosaic artisans enabled this art to be passed on from generation to generation. Indeed, information testifying to the activities of an artisan's laboratory which would later become Filippini & Paoletti first appeared in the second half of the 19th century. Filippini & Paoletti is now in its fourth generation.