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"A radioisotope is an atom that has excess nuclear energy, making it unstable. This excess energy can be used in one of three ways: emitted from the nucleus as gamma radiation; transferred to one of its electrons to release it as a conversion electron; or used to create and emit a new particle from the nucleus."

Bismuth has the longest known half-life of any radioisotope that undergoes α-decay (alpha decay)

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according to the Oxford dictionary.an isotopes is "each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element."

Wikipedia states that "Bismuth-209 (²⁰⁹Bi) is the isotope of bismuth with the longest known half-life of any radioisotope that undergoes α-decay (alpha decay). It has 83 protons and a magic number of 126 neutrons, and an atomic mass of 208.9803987 amu (atomic mass units)."

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a chemical mixture is "a material made up of two or more different Chemical substance/substances which are not chemically combined."

one Bismuth mixture is Bismuth subsalicylate (Pepto-Bismol), which consists of trivalent bismuth and salicylate suspended in a mixture of magnesium aluminium silicate clay. Bismuth salts are generally gray to white powders; hygroscopic; light sensitive. Tripotassium dicitratobismuthate is soluble in water.

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a chemical compound is "a substance formed from two or more elements chemically united in fixed proportions."

Bismuths naturally occurring compounds are chiefly the oxide, the sulfide, and two carbonates.

bismuth compounds are used to create a yellow hue, which are used in paint and cosmetics.

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Pure substances are substances that are made up of only one kind of particle and have a fixed or constant structure.

Pure bismuth can be obtained by reducing the oxide with carbon or by roasting the sulfide in the presence of charcoal and metallic iron to remove the sulfur.

it is used in fire extinguishers, cosmetics, and medicines.

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Bismuth has 5 valence electrons. valence electrons are the electrons in the outer-most shell of an atom. they can form chemical bonds.

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an ion is "an atom or molecule with a net electric charge due to the loss or gain of one or more electrons." - oxford dictionary

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an anion is "a negatively charged ion, i.e. one that would be attracted to the anode in electrolysis." - oxford dictionary

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the oxford dictionary states that the atomic mass is "the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes."

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the oxford dictionary define an atomic number as "the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table."

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bismuth has 126 neutrons. neutrons are neutrally charged ion

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Bismuth has 83 protons. protons are positively charged ion

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Bismuth has 83 electrons. an electron is a negatively charged ion

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"a particle is a small localized object to which can be ascribed several physical or chemical properties, such as volume, density, or mass"

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atoms are the basic unit of a chemical element

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"Chemical symbols are the abbreviations used in chemistry for chemical elements, functional groups and chemical compounds. Element symbols for chemical elements normally consist of one or two letters from the Latin alphabet and are written with the first letter capitalised."

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according to the oxford dictionary, an element is "a substance that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e. the number of protons in the nuclei of its atoms."