Naturally occurring iodine has an atomic mass of 126.9045 amu. A 12.3849 g sample of iodine is accidentally contaminated with an additional 1.00070 g of 129I, a synthetic radioisotope of iodine used in the treatment of certain diseases of the thyroid gland. The mass of 129I is 128.9050 amu. Find the apparent “atomic mass” of the contaminated iodine.

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Q: 1.Which of these is a description of nuclear fission?

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Q: How many neutrons are in the nucleus of the atom 113 Cd? 48

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Q: possible isotopes of cobalt?

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.