For instance, a small amount of carbon exists in the atmosphere as radioactive carbon-14, and the amount of carbon-14 found in fossils allows paleontologists to determine their age.Atoms of each element contain a characteristic number of protons.Nuclear medicine is the branch of medicine that uses radioisotopes for research diagnosis and treatment of disease.Since its humble beginnings in 1958 (see here for details of how it was discovered), technetium-99m has become the most widely used radioisotope for diagnosing diseased organs. Technetium-99m is a metastable isotope of the element technetium.Fundamental properties of atoms including atomic number and atomic mass.The atomic number is the number of protons in an atom, and isotopes have the same atomic number but differ in the number of neutrons. For instance, you might have read about it in discussions of nuclear energy, the Fukushima reactor tragedy, or the development of nuclear weapons.The number of protons within the atom's nucleus is called atomic number and is equal to the number of electrons in the neutral (non-ionized) atom.Each atomic number identifies a specific element, but not the isotope; an atom of a given element may have a wide range in its number of neutrons.
The common isotope of technetium is Tc-98, but it is the metastable isotope of Tc-99 that is most sought after - Tc-99. Tc-99 is ideal as a medical tracer because the gamma radiation it emits allows the medical practitioner to image internal body organs causing hardly any radiation damage to the patient.
There is, however, strong evidence that they used sticks and bones to help them dig and defend themselves.
The term isotope is formed from the Greek roots isos (ἴσος "equal") and topos (τόπος "place"), meaning "the same place"; thus, the meaning behind the name is that different isotopes of a single element occupy the same position on the periodic table.
Astronomy Worksheets Biology Worksheets Coloring Worksheets Dinosaur Worksheets Geology Worksheets Geography Worksheets History Worksheets Holiday Worksheets Math Worksheets Language Arts Worksheets All Educational Worksheets Astronomy Music Biology Music Concepts Music Chemistry Music Foreign Language Music Geology Music Geography Music History Music Language Arts Music Life Skills Music Math Music Physics Music All Educational Music These animals, known as Australopithecus, are believed to have been around three to five feet tall, and probably fed on leaves, fruits, and the remains of dead animals.
There is no evidence that Australopithecus made their own tools.