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The element that has the largest atomic radius is cesium. It has an atomic radius of 298 pm, or picometers. An alkali metal, cesium is so active that it instantly explodes if dropped into cold water. It's also one of the few metals that becomes a liquid at close to room...


The atomic radius describes the size of the atom, and although there is no standard definition for the value, it is the distance between the nucleus and the outermost electrons. Atomic radii tend to increase moving down the periodic table, but they decrease moving left ...


The atomic radius of an atom is determined by the total number of electrons, electron shells and protons in an atom. Protons are located in the nucleus of an atom and create an effective nuclear charge. Electrons within a shell are attracted to the nuclear charge and va...


The chemical element in the second period with the largest atomic radius is lithium, which is followed by beryllium, boron, carbon and nitrogen. The elements with the smallest atomic radius in this period are neon, fluorine and oxygen, respectively.


The term "atomic radius" refers to the measured distance between the nucleus of an atom and the furthest orbiting electron. The outermost electron is referred to as a valance electron. The effective nuclear charge of an atom directly affects the size of the atom and the...


The atomic radius of carbon atom is 70 picometers. The picometer is a very small unit of length, and 1 picometer = 1 x 10-12 meters. The atomic radius is the distance between the nucleus of the atom and the electrons in the outermost shell of the atom.


As of 2014, the atom on the periodic table of elements with the largest known radius is cesium, which has a radius of 298 picometers. For comparison, helium has a radius of 31 picometers. The radius has not been determined for all elements.