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How many half-lives have passed when 25% of parent isotope remains?
Thus in the standard notation, 1/1H refers to the simplest isotope of hydrogen and 235/92U to an isotope of uranium widely used for nuclear power generation and nuclear weapons fabrication. A "stable isotope" is any of two or more forms of an element whos nuclei contains the same number of protons and electrons, but a different number of neutrons.(Authors who do not wish to use symbols sometimes write out the element name and mass numberhydrogen-1 and uranium-235 in the examples above.) Isotopes utilized in nuclear medicine fall into two broad categories: Stable and Unstable. Stable isotopes remain unchanged indefinitely, but "unstable" (radioactive) isotopes undergo spontaneous disintegration.The great importance of the atomic number derives from the observation that all atoms with the same atomic number have nearly, if not precisely, identical chemical properties.A large collection of atoms with the same atomic number constitutes a sample of an element.These electrons determine the chemistry of the atom.
The atomic mass is the sum of the protons and neutrons.What percent of the parent isotope remains after 5 half-lives?If we started with 200 grams of a radioisotope, how much would be left after 2 half-lives?These particles may be accompanied by the emission of energy in the form of electromagnetic radiation known as gamma rays. Radioactive products which are used in medicine are referred to as radiopharmaceuticals.This is a branch of medicine that uses radiation to provide information about the functioning of a person's specific organs or to treat disease.There are 82 stable elements and about 275 stable isotopes of these elements.