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A radioisotope is a radioactive isotope that decays. Polonium-210 undergoes alpha decay. Polonium-210 is a good energy source and is even used in spacecrafts and satellites because of it's energy and weight efficiency.

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An isotope are atoms with the same number of protons but differing amounts of neutrons.

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A mixture is a combination of two or more elements. That can still be separated physically. An example of a mixture would be salt and water.

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A compound is when more than one element combines. An example of a compound is water, H2O.

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Pure substance consists of only a single type of element or a compound.

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The electrons in the most outer shell of an atom. Polonium has 6 valence electrons.

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An anion is a negatively charged ion. Polonium is an anion.

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An ion is a negatively of positively charged particle. Polonium becomes a negative ion.

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Atomic mass is the total mass of an atom. Polonium has an atomic mass of 209u

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A neutron is a neutral particle in an atom. Polonium has 125 neutrons

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A proton is a positively charged particle of an atom. Polonium has 84 protons

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An electron is a negatively charged particle of an atom. Polonium has 84 electrons

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A particle refers to the the things that make up matter

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The tiniest particle of matter

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Polonium
Po