1. What is the composition of the nuclei modeled by these symbols? How many protons and neutrons? ¹4C 131 1 (b) 53 2. Technetium-99 is used to scan the body for a variety of medical conditions including heart disease and tumors the element technetium (Tc) has atomic number 43, (a) write a model of technetium-99 in nuclear notation. (b) How many protons and neutrons are in the technetium-99 nucleus?

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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.